Sequence Database

A database with 899757 machine generated integer and decimal sequences.

Displaying result 0-99 of total 98742. [0] [1] [2] [3] [4] ... [987]

Sequence 4rlzjihdzbx0j

1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, more...

integer, non-monotonic, +, A000203

a(n)=σ(n)
σ(n)=divisor sum of n
n≥1
2 operations
Prime

Sequence tilu3ymww05gg

2, 3, 4, 7, 8, 15, 24, 60, 168, 480, 1512, 4800, 15748, 28672, 65528, more...

integer, strictly-monotonic, +, A007497

a(n)=σ(a(n-1))
a(0)=2
σ(n)=divisor sum of n
n≥0
2 operations
Prime

Sequence iejmrcau0ouom

3, 4, 7, 8, 15, 24, 60, 168, 480, 1512, 4800, 15748, 28672, 65528, more...

integer, strictly-monotonic, +

a(n)=σ(a(n-1))
a(0)=3
σ(n)=divisor sum of n
n≥0
2 operations
Prime

Sequence jzj0xqhwtvxnn

4, 7, 8, 15, 24, 60, 168, 480, 1512, 4800, 15748, 28672, 65528, more...

integer, strictly-monotonic, +

a(n)=σ(a(n-1))
a(0)=4
σ(n)=divisor sum of n
n≥0
2 operations
Prime

Sequence 0xuugesife4dh

5, 6, 12, 28, 56, 120, 360, 1170, 3276, 10192, 24738, 61440, more...

integer, strictly-monotonic, +, A051572

a(n)=σ(a(n-1))
a(0)=5
σ(n)=divisor sum of n
n≥0
2 operations
Prime

Sequence qtn4igfox0zfo

-1, -3, -4, -7, -6, -12, -8, -15, -13, -18, -12, -28, -14, -24, -24, -31, -18, -39, -20, -42, -32, -36, -24, -60, -31, -42, -40, -56, -30, -72, -32, -63, -48, -54, -48, -91, -38, -60, -56, -90, -42, -96, -44, -84, -78, -72, -48, -124, -57, -93, more...

integer, non-monotonic, -

a(n)=-σ(n)
σ(n)=divisor sum of n
n≥1
3 operations
Prime

Sequence aefbil5k01xmc

1, 7, 13, 31, 31, 91, 57, 127, 121, 217, 133, 403, 183, 399, 403, 511, 307, 847, 381, 961, 741, 931, 553, 1651, 781, 1281, 1093, 1767, 871, 2821, 993, 2047, 1729, 2149, 1767, 3751, 1407, 2667, 2379, 3937, 1723, 5187, 1893, 4123, 3751, 3871, 2257, 6643, 2801, 5467, more...

integer, non-monotonic, +, A065764

a(n)=σ(n²)
σ(n)=divisor sum of n
n≥1
3 operations
Prime

Sequence z1wbfz52zf3m

1, 9, 16, 49, 36, 144, 64, 225, 169, 324, 144, 784, 196, 576, 576, 961, 324, 1521, 400, 1764, 1024, 1296, 576, 3600, 961, 1764, 1600, 3136, 900, 5184, 1024, 3969, 2304, 2916, 2304, 8281, 1444, 3600, 3136, 8100, 1764, 9216, 1936, 7056, 6084, 5184, 2304, 15376, 3249, 8649, more...

integer, non-monotonic, +, A072861

a(n)=σ(n)²
σ(n)=divisor sum of n
n≥1
3 operations
Prime

Sequence ixqvudtt542ec

1, 1, 3, 1, 4, 3, 4, 1, 7, 4, 6, 3, 6, 4, 7, 1, 6, 7, 8, 4, 15, 6, 8, 3, 8, 6, 15, 4, 8, 7, 6, 1, 12, 6, 13, 7, 12, 8, 18, 4, 12, 15, 14, 6, 28, 8, 13, 3, 13, 8, more...

integer, non-monotonic, +

a(n)=σ(stern(n))
stern(n)=Stern-Brocot sequence
σ(n)=divisor sum of n
n≥1
3 operations
Prime

Sequence bg1403ulfke3p

1, 2, 1, 3, 2, 2, 1, 4, 5, 4, 2, 3, 3, 2, 2, 5, 4, 10, 3, 8, 1, 4, 2, 4, 5, 8, 3, 3, 4, 4, 1, 6, 2, 8, 2, 19, 7, 4, 3, 12, 8, 2, 5, 8, 10, 4, 2, 5, 10, 16, more...

integer, non-monotonic, +

a(n)=stern(σ(n))
σ(n)=divisor sum of n
stern(n)=Stern-Brocot sequence
n≥1
3 operations
Prime

Sequence uzphzxbqwyiif

-9, -7, -6, -3, -4, 2, -2, 5, 3, 8, 2, 18, 4, 14, 14, 21, 8, 29, 10, 32, 22, 26, 14, 50, 21, 32, 30, 46, 20, 62, 22, 53, 38, 44, 38, 81, 28, 50, 46, 80, 32, 86, 34, 74, 68, 62, 38, 114, 47, 83, more...

integer, non-monotonic, +-

a(n)=σ(n)-10
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence tw4nas1clarmn

-8, -6, -5, -2, -3, 3, -1, 6, 4, 9, 3, 19, 5, 15, 15, 22, 9, 30, 11, 33, 23, 27, 15, 51, 22, 33, 31, 47, 21, 63, 23, 54, 39, 45, 39, 82, 29, 51, 47, 81, 33, 87, 35, 75, 69, 63, 39, 115, 48, 84, more...

integer, non-monotonic, +-

a(n)=σ(n)-9
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence shqylv0qeotwf

-7, -5, -4, -1, -2, 4, 0, 7, 5, 10, 4, 20, 6, 16, 16, 23, 10, 31, 12, 34, 24, 28, 16, 52, 23, 34, 32, 48, 22, 64, 24, 55, 40, 46, 40, 83, 30, 52, 48, 82, 34, 88, 36, 76, 70, 64, 40, 116, 49, 85, more...

integer, non-monotonic, +-

a(n)=σ(n)-8
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence xadezooqbqije

-6, -4, -3, 0, -1, 5, 1, 8, 6, 11, 5, 21, 7, 17, 17, 24, 11, 32, 13, 35, 25, 29, 17, 53, 24, 35, 33, 49, 23, 65, 25, 56, 41, 47, 41, 84, 31, 53, 49, 83, 35, 89, 37, 77, 71, 65, 41, 117, 50, 86, more...

integer, non-monotonic, +-

a(n)=σ(n)-7
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence dydnvj1kbu5if

-5, -3, -2, 1, 0, 6, 2, 9, 7, 12, 6, 22, 8, 18, 18, 25, 12, 33, 14, 36, 26, 30, 18, 54, 25, 36, 34, 50, 24, 66, 26, 57, 42, 48, 42, 85, 32, 54, 50, 84, 36, 90, 38, 78, 72, 66, 42, 118, 51, 87, more...

integer, non-monotonic, +-

a(n)=σ(n)-6
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence w0ayw3efonpoj

-4, -2, -1, 2, 1, 7, 3, 10, 8, 13, 7, 23, 9, 19, 19, 26, 13, 34, 15, 37, 27, 31, 19, 55, 26, 37, 35, 51, 25, 67, 27, 58, 43, 49, 43, 86, 33, 55, 51, 85, 37, 91, 39, 79, 73, 67, 43, 119, 52, 88, more...

integer, non-monotonic, +-

a(n)=σ(n)-5
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence g1xerh1ux31hg

-3, -1, 0, 3, 2, 8, 4, 11, 9, 14, 8, 24, 10, 20, 20, 27, 14, 35, 16, 38, 28, 32, 20, 56, 27, 38, 36, 52, 26, 68, 28, 59, 44, 50, 44, 87, 34, 56, 52, 86, 38, 92, 40, 80, 74, 68, 44, 120, 53, 89, more...

integer, non-monotonic, +-

a(n)=σ(n)-4
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence eyuzaqo0pixtf

-2.1415926536, -0.1415926536, 0.8584073464, 3.8584073464, 2.8584073464, 8.8584073464, 4.8584073464, 11.8584073464, 9.8584073464, 14.8584073464, 8.8584073464, 24.8584073464, 10.8584073464, 20.8584073464, 20.8584073464, 27.8584073464, 14.8584073464, 35.8584073464, 16.8584073464, 38.8584073464, 28.8584073464, 32.8584073464, 20.8584073464, 56.8584073464, 27.8584073464, more...

decimal, non-monotonic, +-

a(n)=σ(n)-π
σ(n)=divisor sum of n
π=3.141...
n≥1
4 operations
Prime

Sequence 4x14a22vqdfal

-2, 0, 1, 4, 3, 9, 5, 12, 10, 15, 9, 25, 11, 21, 21, 28, 15, 36, 17, 39, 29, 33, 21, 57, 28, 39, 37, 53, 27, 69, 29, 60, 45, 51, 45, 88, 35, 57, 53, 87, 39, 93, 41, 81, 75, 69, 45, 121, 54, 90, more...

integer, non-monotonic, +-

a(n)=σ(n)-3
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence cvtthccs1s3nl

-1, 1, 2, 5, 4, 10, 6, 13, 11, 16, 10, 26, 12, 22, 22, 29, 16, 37, 18, 40, 30, 34, 22, 58, 29, 40, 38, 54, 28, 70, 30, 61, 46, 52, 46, 89, 36, 58, 54, 88, 40, 94, 42, 82, 76, 70, 46, 122, 55, 91, more...

integer, non-monotonic, +-

a(n)=σ(n)-2
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence 5hvsftyz2w44n

0, -2, -3, -6, -5, -11, -7, -14, -12, -17, -11, -27, -13, -23, -23, -30, -17, -38, -19, -41, -31, -35, -23, -59, -30, -41, -39, -55, -29, -71, -31, -62, -47, -53, -47, -90, -37, -59, -55, -89, -41, -95, -43, -83, -77, -71, -47, -123, -56, -92, more...

integer, non-monotonic, -

a(n)=1-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence lzczrqgxjnzeo

0, 2, 3, 6, 5, 11, 7, 14, 12, 17, 11, 27, 13, 23, 23, 30, 17, 38, 19, 41, 31, 35, 23, 59, 30, 41, 39, 55, 29, 71, 31, 62, 47, 53, 47, 90, 37, 59, 55, 89, 41, 95, 43, 83, 77, 71, 47, 123, 56, 92, more...

integer, non-monotonic, +

a(n)=σ(n)-1
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence gx2dhdzxff4up

0.1, 0.3, 0.4, 0.7, 0.6, 1.2, 0.8, 1.5, 1.3, 1.8, 1.2, 2.8, 1.4, 2.4, 2.4, 3.1, 1.8, 3.9, 2, 4.2, 3.2, 3.6, 2.4, 6, 3.1, more...

decimal, non-monotonic, +

a(n)=σ(n)/10
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence i32euonkeffjb

0.1111111111, 0.3333333333, 0.4444444444, 0.7777777778, 0.6666666667, 1.3333333333, 0.8888888889, 1.6666666667, 1.4444444444, 2, 1.3333333333, 3.1111111111, 1.5555555556, 2.6666666667, 2.6666666667, 3.4444444444, 2, 4.3333333333, 2.2222222222, 4.6666666667, 3.5555555556, 4, 2.6666666667, 6.6666666667, 3.4444444444, more...

decimal, non-monotonic, +

a(n)=σ(n)/9
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence fbdkhzm2pbmnl

0.125, 0.375, 0.5, 0.875, 0.75, 1.5, 1, 1.875, 1.625, 2.25, 1.5, 3.5, 1.75, 3, 3, 3.875, 2.25, 4.875, 2.5, 5.25, 4, 4.5, 3, 7.5, 3.875, more...

decimal, non-monotonic, +

a(n)=σ(n)/8
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence q2ss5o4ujepin

0.1428571429, 0.4285714286, 0.5714285714, 1, 0.8571428571, 1.7142857143, 1.1428571429, 2.1428571429, 1.8571428571, 2.5714285714, 1.7142857143, 4, 2, 3.4285714286, 3.4285714286, 4.4285714286, 2.5714285714, 5.5714285714, 2.8571428571, 6, 4.5714285714, 5.1428571429, 3.4285714286, 8.5714285714, 4.4285714286, more...

decimal, non-monotonic, +

a(n)=σ(n)/7
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence 5gz4qp3il3etn

0.1666666667, 0.5, 0.6666666667, 1.1666666667, 1, 2, 1.3333333333, 2.5, 2.1666666667, 3, 2, 4.6666666667, 2.3333333333, 4, 4, 5.1666666667, 3, 6.5, 3.3333333333, 7, 5.3333333333, 6, 4, 10, 5.1666666667, more...

decimal, non-monotonic, +

a(n)=σ(n)/6
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence z2zlkqlg1fhyg

0.2, 0.6, 0.8, 1.4, 1.2, 2.4, 1.6, 3, 2.6, 3.6, 2.4, 5.6, 2.8, 4.8, 4.8, 6.2, 3.6, 7.8, 4, 8.4, 6.4, 7.2, 4.8, 12, 6.2, more...

decimal, non-monotonic, +

a(n)=σ(n)/5
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence w0ufywuv4abpk

0.25, 0.75, 1, 1.75, 1.5, 3, 2, 3.75, 3.25, 4.5, 3, 7, 3.5, 6, 6, 7.75, 4.5, 9.75, 5, 10.5, 8, 9, 6, 15, 7.75, more...

decimal, non-monotonic, +

a(n)=σ(n)/4
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence wlfngj4tjpahg

0.3183098862, 0.9549296586, 1.2732395447, 2.2281692033, 1.9098593171, 3.8197186342, 2.5464790895, 4.7746482928, 4.1380285204, 5.7295779513, 3.8197186342, 8.9126768131, 4.4563384066, 7.6394372684, 7.6394372684, 9.8676064717, 5.7295779513, 12.4140855612, 6.3661977237, 13.3690152197, 10.1859163579, 11.4591559026, 7.6394372684, 19.098593171, 9.8676064717, more...

decimal, non-monotonic, +

a(n)=σ(n)/π
σ(n)=divisor sum of n
π=3.141...
n≥1
4 operations
Prime

Sequence auuiiq4s45ete

0.3333333333, 1, 1.3333333333, 2.3333333333, 2, 4, 2.6666666667, 5, 4.3333333333, 6, 4, 9.3333333333, 4.6666666667, 8, 8, 10.3333333333, 6, 13, 6.6666666667, 14, 10.6666666667, 12, 8, 20, 10.3333333333, more...

decimal, non-monotonic, +

a(n)=σ(n)/3
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence yisdlra2qvqj

0.5, 1.5, 2, 3.5, 3, 6, 4, 7.5, 6.5, 9, 6, 14, 7, 12, 12, 15.5, 9, 19.5, 10, 21, 16, 18, 12, 30, 15.5, more...

decimal, non-monotonic, +

a(n)=σ(n)/2
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence luu4fxbhkitdc

1, -1, -2, -5, -4, -10, -6, -13, -11, -16, -10, -26, -12, -22, -22, -29, -16, -37, -18, -40, -30, -34, -22, -58, -29, -40, -38, -54, -28, -70, -30, -61, -46, -52, -46, -89, -36, -58, -54, -88, -40, -94, -42, -82, -76, -70, -46, -122, -55, -91, more...

integer, non-monotonic, +-

a(n)=2-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence k3fb1r3ssc55

1, 0.3333333333, 0.25, 0.1428571429, 0.1666666667, 0.0833333333, 0.125, 0.0666666667, 0.0769230769, 0.0555555556, 0.0833333333, 0.0357142857, 0.0714285714, 0.0416666667, 0.0416666667, 0.0322580645, 0.0555555556, 0.0256410256, 0.05, 0.0238095238, 0.03125, 0.0277777778, 0.0416666667, 0.0166666667, 0.0322580645, more...

decimal, non-monotonic, +

a(n)=1/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence svjhj5yob14pg

2, 0, -1, -4, -3, -9, -5, -12, -10, -15, -9, -25, -11, -21, -21, -28, -15, -36, -17, -39, -29, -33, -21, -57, -28, -39, -37, -53, -27, -69, -29, -60, -45, -51, -45, -88, -35, -57, -53, -87, -39, -93, -41, -81, -75, -69, -45, -121, -54, -90, more...

integer, non-monotonic, +-

a(n)=3-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence igmrancddpoan

2, 0.6666666667, 0.5, 0.2857142857, 0.3333333333, 0.1666666667, 0.25, 0.1333333333, 0.1538461538, 0.1111111111, 0.1666666667, 0.0714285714, 0.1428571429, 0.0833333333, 0.0833333333, 0.064516129, 0.1111111111, 0.0512820513, 0.1, 0.0476190476, 0.0625, 0.0555555556, 0.0833333333, 0.0333333333, 0.064516129, more...

decimal, non-monotonic, +

a(n)=2/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence v1xi1vbtj2ndp

2, 4, 5, 8, 7, 13, 9, 16, 14, 19, 13, 29, 15, 25, 25, 32, 19, 40, 21, 43, 33, 37, 25, 61, 32, 43, 41, 57, 31, 73, 33, 64, 49, 55, 49, 92, 39, 61, 57, 91, 43, 97, 45, 85, 79, 73, 49, 125, 58, 94, more...

integer, non-monotonic, +, A088580

a(n)=1+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence fe15rt30r305

2, 6, 8, 14, 12, 24, 16, 30, 26, 36, 24, 56, 28, 48, 48, 62, 36, 78, 40, 84, 64, 72, 48, 120, 62, 84, 80, 112, 60, 144, 64, 126, 96, 108, 96, 182, 76, 120, 112, 180, 84, 192, 88, 168, 156, 144, 96, 248, 114, 186, more...

integer, non-monotonic, +, A074400

a(n)=2*σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence 3lv2s5yyy3ped

2.1415926536, 0.1415926536, -0.8584073464, -3.8584073464, -2.8584073464, -8.8584073464, -4.8584073464, -11.8584073464, -9.8584073464, -14.8584073464, -8.8584073464, -24.8584073464, -10.8584073464, -20.8584073464, -20.8584073464, -27.8584073464, -14.8584073464, -35.8584073464, -16.8584073464, -38.8584073464, -28.8584073464, -32.8584073464, -20.8584073464, -56.8584073464, -27.8584073464, more...

decimal, non-monotonic, +-

a(n)=π-σ(n)
π=3.141...
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence l5nkcnqogwtfk

3, 1, 0, -3, -2, -8, -4, -11, -9, -14, -8, -24, -10, -20, -20, -27, -14, -35, -16, -38, -28, -32, -20, -56, -27, -38, -36, -52, -26, -68, -28, -59, -44, -50, -44, -87, -34, -56, -52, -86, -38, -92, -40, -80, -74, -68, -44, -120, -53, -89, more...

integer, non-monotonic, +-

a(n)=4-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence aug2roguoahnn

3, 1, 0.75, 0.4285714286, 0.5, 0.25, 0.375, 0.2, 0.2307692308, 0.1666666667, 0.25, 0.1071428571, 0.2142857143, 0.125, 0.125, 0.0967741935, 0.1666666667, 0.0769230769, 0.15, 0.0714285714, 0.09375, 0.0833333333, 0.125, 0.05, 0.0967741935, more...

decimal, non-monotonic, +

a(n)=3/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence i2zaq2h1klr2g

3, 4, 7, 6, 12, 8, 15, 13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, more...

integer, non-monotonic, +

a(n)=σ(2+n)
σ(n)=divisor sum of n
n≥0
4 operations
Prime

Sequence k3z0dvbbmpc4b

3, 5, 6, 9, 8, 14, 10, 17, 15, 20, 14, 30, 16, 26, 26, 33, 20, 41, 22, 44, 34, 38, 26, 62, 33, 44, 42, 58, 32, 74, 34, 65, 50, 56, 50, 93, 40, 62, 58, 92, 44, 98, 46, 86, 80, 74, 50, 126, 59, 95, more...

integer, non-monotonic, +

a(n)=2+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence woqq4zmc41e2k

3, 7, 12, 15, 18, 28, 24, 31, 39, 42, 36, 60, 42, 56, 72, 63, 54, 91, 60, 90, 96, 84, 72, 124, 93, 98, 120, 120, 90, 168, 96, 127, 144, 126, 144, 195, 114, 140, 168, 186, 126, 224, 132, 180, 234, 168, 144, 252, 171, 217, more...

integer, non-monotonic, +, A062731

a(n)=σ(2*n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence 4maycfkxkbmfo

3, 9, 12, 21, 18, 36, 24, 45, 39, 54, 36, 84, 42, 72, 72, 93, 54, 117, 60, 126, 96, 108, 72, 180, 93, 126, 120, 168, 90, 216, 96, 189, 144, 162, 144, 273, 114, 180, 168, 270, 126, 288, 132, 252, 234, 216, 144, 372, 171, 279, more...

integer, non-monotonic, +, A272027

a(n)=3*σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence tbhtkmmsavqcj

3.1415926536, 1.0471975512, 0.7853981634, 0.4487989505, 0.5235987756, 0.2617993878, 0.3926990817, 0.2094395102, 0.2416609734, 0.1745329252, 0.2617993878, 0.1121997376, 0.2243994753, 0.1308996939, 0.1308996939, 0.1013416985, 0.1745329252, 0.0805536578, 0.1570796327, 0.0747998251, 0.0981747704, 0.0872664626, 0.1308996939, 0.0523598776, 0.1013416985, more...

decimal, non-monotonic, +

a(n)=π/σ(n)
π=3.141...
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence trbtxcijrhpvh

3.1415926536, 9.4247779608, 12.5663706144, 21.9911485751, 18.8495559215, 37.6991118431, 25.1327412287, 47.1238898038, 40.8407044967, 56.5486677646, 37.6991118431, 87.9645943005, 43.9822971503, 75.3982236862, 75.3982236862, 97.3893722613, 56.5486677646, 122.52211349, 62.8318530718, 131.9468914508, 100.5309649149, 113.0973355292, 75.3982236862, 188.4955592154, 97.3893722613, more...

decimal, non-monotonic, +

a(n)=π*σ(n)
π=3.141...
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence zydibio2m4fhl

4, 1.3333333333, 1, 0.5714285714, 0.6666666667, 0.3333333333, 0.5, 0.2666666667, 0.3076923077, 0.2222222222, 0.3333333333, 0.1428571429, 0.2857142857, 0.1666666667, 0.1666666667, 0.1290322581, 0.2222222222, 0.1025641026, 0.2, 0.0952380952, 0.125, 0.1111111111, 0.1666666667, 0.0666666667, 0.1290322581, more...

decimal, non-monotonic, +

a(n)=4/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence xukyj3enia05g

4, 2, 1, -2, -1, -7, -3, -10, -8, -13, -7, -23, -9, -19, -19, -26, -13, -34, -15, -37, -27, -31, -19, -55, -26, -37, -35, -51, -25, -67, -27, -58, -43, -49, -43, -86, -33, -55, -51, -85, -37, -91, -39, -79, -73, -67, -43, -119, -52, -88, more...

integer, non-monotonic, +-

a(n)=5-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence vbim02vr0snmn

4, 6, 7, 10, 9, 15, 11, 18, 16, 21, 15, 31, 17, 27, 27, 34, 21, 42, 23, 45, 35, 39, 27, 63, 34, 45, 43, 59, 33, 75, 35, 66, 51, 57, 51, 94, 41, 63, 59, 93, 45, 99, 47, 87, 81, 75, 51, 127, 60, 96, more...

integer, non-monotonic, +

a(n)=3+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence ng3icavq3kylm

4, 7, 6, 12, 8, 15, 13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, 98, more...

integer, non-monotonic, +

a(n)=σ(3+n)
σ(n)=divisor sum of n
n≥0
4 operations
Prime

Sequence fu2eqpp2n5pvi

4, 12, 13, 28, 24, 39, 32, 60, 40, 72, 48, 91, 56, 96, 78, 124, 72, 120, 80, 168, 104, 144, 96, 195, 124, 168, 121, 224, 120, 234, 128, 252, 156, 216, 192, 280, 152, 240, 182, 360, 168, 312, 176, 336, 240, 288, 192, 403, 228, 372, more...

integer, non-monotonic, +, A144613

a(n)=σ(3*n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence awspdc0u1b3hi

4, 12, 16, 28, 24, 48, 32, 60, 52, 72, 48, 112, 56, 96, 96, 124, 72, 156, 80, 168, 128, 144, 96, 240, 124, 168, 160, 224, 120, 288, 128, 252, 192, 216, 192, 364, 152, 240, 224, 360, 168, 384, 176, 336, 312, 288, 192, 496, 228, 372, more...

integer, non-monotonic, +, A239050

a(n)=4*σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence pddbvv1tygv3c

4.1415926536, 6.1415926536, 7.1415926536, 10.1415926536, 9.1415926536, 15.1415926536, 11.1415926536, 18.1415926536, 16.1415926536, 21.1415926536, 15.1415926536, 31.1415926536, 17.1415926536, 27.1415926536, 27.1415926536, 34.1415926536, 21.1415926536, 42.1415926536, 23.1415926536, 45.1415926536, 35.1415926536, 39.1415926536, 27.1415926536, 63.1415926536, 34.1415926536, more...

decimal, non-monotonic, +

a(n)=π+σ(n)
π=3.141...
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence j3ssrrfugqtan

5, 1.6666666667, 1.25, 0.7142857143, 0.8333333333, 0.4166666667, 0.625, 0.3333333333, 0.3846153846, 0.2777777778, 0.4166666667, 0.1785714286, 0.3571428571, 0.2083333333, 0.2083333333, 0.1612903226, 0.2777777778, 0.1282051282, 0.25, 0.119047619, 0.15625, 0.1388888889, 0.2083333333, 0.0833333333, 0.1612903226, more...

decimal, non-monotonic, +

a(n)=5/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence 5fwnv3v4xrjg

5, 3, 2, -1, 0, -6, -2, -9, -7, -12, -6, -22, -8, -18, -18, -25, -12, -33, -14, -36, -26, -30, -18, -54, -25, -36, -34, -50, -24, -66, -26, -57, -42, -48, -42, -85, -32, -54, -50, -84, -36, -90, -38, -78, -72, -66, -42, -118, -51, -87, more...

integer, non-monotonic, +-

a(n)=6-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence bskdk2sjzbnap

5, 7, 8, 11, 10, 16, 12, 19, 17, 22, 16, 32, 18, 28, 28, 35, 22, 43, 24, 46, 36, 40, 28, 64, 35, 46, 44, 60, 34, 76, 36, 67, 52, 58, 52, 95, 42, 64, 60, 94, 46, 100, 48, 88, 82, 76, 52, 128, 61, 97, more...

integer, non-monotonic, +

a(n)=4+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence xigzx4bh2nqte

5, 15, 20, 35, 30, 60, 40, 75, 65, 90, 60, 140, 70, 120, 120, 155, 90, 195, 100, 210, 160, 180, 120, 300, 155, 210, 200, 280, 150, 360, 160, 315, 240, 270, 240, 455, 190, 300, 280, 450, 210, 480, 220, 420, 390, 360, 240, 620, 285, 465, more...

integer, non-monotonic, +, A274535

a(n)=5*σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence zqdcifiyz5mbb

6, 2, 1.5, 0.8571428571, 1, 0.5, 0.75, 0.4, 0.4615384615, 0.3333333333, 0.5, 0.2142857143, 0.4285714286, 0.25, 0.25, 0.1935483871, 0.3333333333, 0.1538461538, 0.3, 0.1428571429, 0.1875, 0.1666666667, 0.25, 0.1, 0.1935483871, more...

decimal, non-monotonic, +

a(n)=6/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence 2zwiu20zxcefe

6, 4, 3, 0, 1, -5, -1, -8, -6, -11, -5, -21, -7, -17, -17, -24, -11, -32, -13, -35, -25, -29, -17, -53, -24, -35, -33, -49, -23, -65, -25, -56, -41, -47, -41, -84, -31, -53, -49, -83, -35, -89, -37, -77, -71, -65, -41, -117, -50, -86, more...

integer, non-monotonic, +-

a(n)=7-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence wicp5ldae2syc

6, 8, 9, 12, 11, 17, 13, 20, 18, 23, 17, 33, 19, 29, 29, 36, 23, 44, 25, 47, 37, 41, 29, 65, 36, 47, 45, 61, 35, 77, 37, 68, 53, 59, 53, 96, 43, 65, 61, 95, 47, 101, 49, 89, 83, 77, 53, 129, 62, 98, more...

integer, non-monotonic, +

a(n)=5+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence fqwpsub5n55ab

6, 12, 8, 15, 13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, 98, 54, 120, more...

integer, non-monotonic, +

a(n)=σ(5+n)
σ(n)=divisor sum of n
n≥0
4 operations
Prime

Sequence akd54mhbujeie

6, 18, 24, 42, 31, 72, 48, 90, 78, 93, 72, 168, 84, 144, 124, 186, 108, 234, 120, 217, 192, 216, 144, 360, 156, 252, 240, 336, 180, 372, 192, 378, 288, 324, 248, 546, 228, 360, 336, 465, 252, 576, 264, 504, 403, 432, 288, 744, 342, 468, more...

integer, non-monotonic, +, A283118

a(n)=σ(5*n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence p4cuwagv3khuf

6, 18, 24, 42, 36, 72, 48, 90, 78, 108, 72, 168, 84, 144, 144, 186, 108, 234, 120, 252, 192, 216, 144, 360, 186, 252, 240, 336, 180, 432, 192, 378, 288, 324, 288, 546, 228, 360, 336, 540, 252, 576, 264, 504, 468, 432, 288, 744, 342, 558, more...

integer, non-monotonic, +, A274536

a(n)=6*σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence uj0gzlmnxfwkc

7, 2.3333333333, 1.75, 1, 1.1666666667, 0.5833333333, 0.875, 0.4666666667, 0.5384615385, 0.3888888889, 0.5833333333, 0.25, 0.5, 0.2916666667, 0.2916666667, 0.2258064516, 0.3888888889, 0.1794871795, 0.35, 0.1666666667, 0.21875, 0.1944444444, 0.2916666667, 0.1166666667, 0.2258064516, more...

decimal, non-monotonic, +

a(n)=7/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence 5i2ztzpe4lwsk

7, 5, 4, 1, 2, -4, 0, -7, -5, -10, -4, -20, -6, -16, -16, -23, -10, -31, -12, -34, -24, -28, -16, -52, -23, -34, -32, -48, -22, -64, -24, -55, -40, -46, -40, -83, -30, -52, -48, -82, -34, -88, -36, -76, -70, -64, -40, -116, -49, -85, more...

integer, non-monotonic, +-

a(n)=8-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence dudxs0orgzxid

7, 6, 12, 8, 15, 13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, 98, 54, more...

integer, non-monotonic, +

a(n)=σ(4+n)
σ(n)=divisor sum of n
n≥0
4 operations
Prime

Sequence dja50mj2bxnjh

7, 9, 10, 13, 12, 18, 14, 21, 19, 24, 18, 34, 20, 30, 30, 37, 24, 45, 26, 48, 38, 42, 30, 66, 37, 48, 46, 62, 36, 78, 38, 69, 54, 60, 54, 97, 44, 66, 62, 96, 48, 102, 50, 90, 84, 78, 54, 130, 63, 99, more...

integer, non-monotonic, +

a(n)=6+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence sykykhs35updp

7, 15, 28, 31, 42, 60, 56, 63, 91, 90, 84, 124, 98, 120, 168, 127, 126, 195, 140, 186, 224, 180, 168, 252, 217, 210, 280, 248, 210, 360, 224, 255, 336, 270, 336, 403, 266, 300, 392, 378, 294, 480, 308, 372, 546, 360, 336, 508, 399, 465, more...

integer, non-monotonic, +, A193553

a(n)=σ(4*n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence dng34kpgledlb

7, 21, 28, 49, 42, 84, 56, 105, 91, 126, 84, 196, 98, 168, 168, 217, 126, 273, 140, 294, 224, 252, 168, 420, 217, 294, 280, 392, 210, 504, 224, 441, 336, 378, 336, 637, 266, 420, 392, 630, 294, 672, 308, 588, 546, 504, 336, 868, 399, 651, more...

integer, non-monotonic, +

a(n)=7*σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence kgcbs1mupoead

8, 2.6666666667, 2, 1.1428571429, 1.3333333333, 0.6666666667, 1, 0.5333333333, 0.6153846154, 0.4444444444, 0.6666666667, 0.2857142857, 0.5714285714, 0.3333333333, 0.3333333333, 0.2580645161, 0.4444444444, 0.2051282051, 0.4, 0.1904761905, 0.25, 0.2222222222, 0.3333333333, 0.1333333333, 0.2580645161, more...

decimal, non-monotonic, +

a(n)=8/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence wru23jeokz0m

8, 6, 5, 2, 3, -3, 1, -6, -4, -9, -3, -19, -5, -15, -15, -22, -9, -30, -11, -33, -23, -27, -15, -51, -22, -33, -31, -47, -21, -63, -23, -54, -39, -45, -39, -82, -29, -51, -47, -81, -33, -87, -35, -75, -69, -63, -39, -115, -48, -84, more...

integer, non-monotonic, +-

a(n)=9-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence ggqrldvjyqpo

8, 10, 11, 14, 13, 19, 15, 22, 20, 25, 19, 35, 21, 31, 31, 38, 25, 46, 27, 49, 39, 43, 31, 67, 38, 49, 47, 63, 37, 79, 39, 70, 55, 61, 55, 98, 45, 67, 63, 97, 49, 103, 51, 91, 85, 79, 55, 131, 64, 100, more...

integer, non-monotonic, +

a(n)=7+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence g454uopudtvyg

8, 15, 13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, 98, 54, 120, 72, 120, more...

integer, non-monotonic, +

a(n)=σ(7+n)
σ(n)=divisor sum of n
n≥0
4 operations
Prime

Sequence rjvpfdvtmuzoj

8, 24, 32, 56, 48, 96, 57, 120, 104, 144, 96, 224, 112, 171, 192, 248, 144, 312, 160, 336, 228, 288, 192, 480, 248, 336, 320, 399, 240, 576, 256, 504, 384, 432, 342, 728, 304, 480, 448, 720, 336, 684, 352, 672, 624, 576, 384, 992, 400, 744, more...

integer, non-monotonic, +, A283078

a(n)=σ(7*n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence q4yclovelze1c

8, 24, 32, 56, 48, 96, 64, 120, 104, 144, 96, 224, 112, 192, 192, 248, 144, 312, 160, 336, 256, 288, 192, 480, 248, 336, 320, 448, 240, 576, 256, 504, 384, 432, 384, 728, 304, 480, 448, 720, 336, 768, 352, 672, 624, 576, 384, 992, 456, 744, more...

integer, non-monotonic, +

a(n)=8*σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence hkmoi2y4ls5gd

9, 3, 2.25, 1.2857142857, 1.5, 0.75, 1.125, 0.6, 0.6923076923, 0.5, 0.75, 0.3214285714, 0.6428571429, 0.375, 0.375, 0.2903225806, 0.5, 0.2307692308, 0.45, 0.2142857143, 0.28125, 0.25, 0.375, 0.15, 0.2903225806, more...

decimal, non-monotonic, +

a(n)=9/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence nhyfdk1opge3l

9, 7, 6, 3, 4, -2, 2, -5, -3, -8, -2, -18, -4, -14, -14, -21, -8, -29, -10, -32, -22, -26, -14, -50, -21, -32, -30, -46, -20, -62, -22, -53, -38, -44, -38, -81, -28, -50, -46, -80, -32, -86, -34, -74, -68, -62, -38, -114, -47, -83, more...

integer, non-monotonic, +-

a(n)=10-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence qsnbppylmaxmi

9, 11, 12, 15, 14, 20, 16, 23, 21, 26, 20, 36, 22, 32, 32, 39, 26, 47, 28, 50, 40, 44, 32, 68, 39, 50, 48, 64, 38, 80, 40, 71, 56, 62, 56, 99, 46, 68, 64, 98, 50, 104, 52, 92, 86, 80, 56, 132, 65, 101, more...

integer, non-monotonic, +

a(n)=8+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence ummqhqkz13llk

9, 27, 36, 63, 54, 108, 72, 135, 117, 162, 108, 252, 126, 216, 216, 279, 162, 351, 180, 378, 288, 324, 216, 540, 279, 378, 360, 504, 270, 648, 288, 567, 432, 486, 432, 819, 342, 540, 504, 810, 378, 864, 396, 756, 702, 648, 432, 1116, 513, 837, more...

integer, non-monotonic, +

a(n)=9*σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence gb3wu2gkokskp

10, 3.3333333333, 2.5, 1.4285714286, 1.6666666667, 0.8333333333, 1.25, 0.6666666667, 0.7692307692, 0.5555555556, 0.8333333333, 0.3571428571, 0.7142857143, 0.4166666667, 0.4166666667, 0.3225806452, 0.5555555556, 0.2564102564, 0.5, 0.2380952381, 0.3125, 0.2777777778, 0.4166666667, 0.1666666667, 0.3225806452, more...

decimal, non-monotonic, +

a(n)=10/σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence owfqkq0yr00uh

10, 12, 13, 16, 15, 21, 17, 24, 22, 27, 21, 37, 23, 33, 33, 40, 27, 48, 29, 51, 41, 45, 33, 69, 40, 51, 49, 65, 39, 81, 41, 72, 57, 63, 57, 100, 47, 69, 65, 99, 51, 105, 53, 93, 87, 81, 57, 133, 66, 102, more...

integer, non-monotonic, +

a(n)=9+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence xsurt3u3fur4m

10, 30, 40, 70, 60, 120, 80, 150, 130, 180, 120, 280, 140, 240, 240, 310, 180, 390, 200, 420, 320, 360, 240, 600, 310, 420, 400, 560, 300, 720, 320, 630, 480, 540, 480, 910, 380, 600, 560, 900, 420, 960, 440, 840, 780, 720, 480, 1240, 570, 930, more...

integer, non-monotonic, +

a(n)=10*σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence t4oay4wgjji3p

11, 13, 14, 17, 16, 22, 18, 25, 23, 28, 22, 38, 24, 34, 34, 41, 28, 49, 30, 52, 42, 46, 34, 70, 41, 52, 50, 66, 40, 82, 42, 73, 58, 64, 58, 101, 48, 70, 66, 100, 52, 106, 54, 94, 88, 82, 58, 134, 67, 103, more...

integer, non-monotonic, +

a(n)=10+σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence 4uqfoyaoy5cl

12, 8, 15, 13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, 98, 54, 120, 72, more...

integer, non-monotonic, +

a(n)=σ(6+n)
σ(n)=divisor sum of n
n≥0
4 operations
Prime

Sequence uwx0u22zrvi3e

12, 28, 39, 60, 72, 91, 96, 124, 120, 168, 144, 195, 168, 224, 234, 252, 216, 280, 240, 360, 312, 336, 288, 403, 372, 392, 363, 480, 360, 546, 384, 508, 468, 504, 576, 600, 456, 560, 546, 744, 504, 728, 528, 720, 720, 672, 576, 819, 684, 868, more...

integer, non-monotonic, +, A224613

a(n)=σ(6*n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence zndskbborfxdc

13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, 98, 54, 120, 72, 120, 80, 90, more...

integer, non-monotonic, +

a(n)=σ(9+n)
σ(n)=divisor sum of n
n≥0
4 operations
Prime

Sequence rmnipbxgv04in

13, 39, 40, 91, 78, 120, 104, 195, 121, 234, 156, 280, 182, 312, 240, 403, 234, 363, 260, 546, 320, 468, 312, 600, 403, 546, 364, 728, 390, 720, 416, 819, 480, 702, 624, 847, 494, 780, 560, 1170, 546, 960, 572, 1092, 726, 936, 624, 1240, 741, 1209, more...

integer, non-monotonic, +, A283123

a(n)=σ(9*n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence mnmvn0yg3qxxb

15, 13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, 98, 54, 120, 72, 120, 80, more...

integer, non-monotonic, +

a(n)=σ(8+n)
σ(n)=divisor sum of n
n≥0
4 operations
Prime

Sequence rit0vvnrpq1go

15, 31, 60, 63, 90, 124, 120, 127, 195, 186, 180, 252, 210, 248, 360, 255, 270, 403, 300, 378, 480, 372, 360, 508, 465, 434, 600, 504, 450, 744, 480, 511, 720, 558, 720, 819, 570, 620, 840, 762, 630, 992, 660, 756, 1170, 744, 720, 1020, 855, 961, more...

integer, non-monotonic, +, A283122

a(n)=σ(8*n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence 5mzgcx1n4eqhg

18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, 98, 54, 120, 72, 120, 80, 90, 60, more...

integer, non-monotonic, +

a(n)=σ(10+n)
σ(n)=divisor sum of n
n≥0
4 operations
Prime

Sequence wug0mkvynf12

18, 42, 72, 90, 93, 168, 144, 186, 234, 217, 216, 360, 252, 336, 372, 378, 324, 546, 360, 465, 576, 504, 432, 744, 468, 588, 720, 720, 540, 868, 576, 762, 864, 756, 744, 1170, 684, 840, 1008, 961, 756, 1344, 792, 1080, 1209, 1008, 864, 1512, 1026, 1092, more...

integer, non-monotonic, +

a(n)=σ(10*n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence n3rouknyaj1up

0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, more...

integer, non-monotonic, +

a(n)=cf(σ(n))
σ(n)=divisor sum of n
cf(a)=characteristic function of a (in range)
n≥1
3 operations
Prime

Sequence hvyjws2oekjnf

0, 2, 5, 9, 10, 11, 16, 17, 19, 21, 22, 23, 25, 26, 27, 29, 33, 34, 35, 37, 41, 43, 45, 46, 47, 49, 50, more...

integer, strictly-monotonic, +

a(n)=comp(σ(n))
σ(n)=divisor sum of n
comp(a)=complement function of a (in range)
n≥1
3 operations
Prime

Sequence gkto0vnlal2j

1, 3, 12, 84, 504, 6048, 48384, 725760, 9434880, 169827840, 2037934080, 57062154240, more...

integer, strictly-monotonic, +, A066780

a(n)=∏(σ(n))
σ(n)=divisor sum of n
∏(a)=partial products of a
n≥1
3 operations
Prime

Sequence vb1nfcs3ptxyk

1, 4, 8, 15, 21, 33, 41, 56, 69, 87, 99, 127, 141, 165, 189, 220, 238, 277, 297, 339, 371, 407, 431, 491, 522, 564, 604, 660, 690, 762, 794, 857, 905, 959, 1007, 1098, 1136, 1196, 1252, 1342, 1384, 1480, 1524, 1608, 1686, 1758, 1806, 1930, 1987, 2080, more...

integer, strictly-monotonic, +, A024916

a(n)=∑(σ(n))
σ(n)=divisor sum of n
∑(a)=partial sums of a
n≥1
3 operations
Prime

Sequence cdsdrgmnzdvdc

1, 4, 12, 18, 24, 32, 56, 91, 78, 72, 144, 168, 112, 192, 360, 270, 234, 260, 360, 576, 384, 288, 672, 868, 434, 560, 960, 720, 720, 768, 992, 1488, 864, 864, 1872, 1482, 760, 1120, 2352, 1764, 1344, 1408, 1584, 2808, 1872, 1152, 2880, 3420, 1767, 2232, more...

integer, non-monotonic, +, A074285

a(n)=σ(∑(n))
∑(a)=partial sums of a
σ(n)=divisor sum of n
n≥1
3 operations
Prime

Sequence 21krlsdoco1fe

2, 1, 3, -1, 6, -4, 7, -2, 5, -6, 16, -14, 10, 0, 7, -13, 21, -19, 22, -10, 4, -12, 36, -29, 11, -2, 16, -26, 42, -40, 31, -15, 6, -6, 43, -53, 22, -4, 34, -48, 54, -52, 40, -6, -6, -24, 76, -67, 36, -21, more...

integer, non-monotonic, +-, A053222

a(n)=Δ(σ(n))
σ(n)=divisor sum of n
Δ(a)=differences of a
n≥1
3 operations
Prime

Sequence b4n1epjrqdcbo

0, -1, -1, -3, -1, -6, -1, -7, -4, -8, -1, -16, -1, -10, -9, -15, -1, -21, -1, -22, -11, -14, -1, -36, -6, -16, -13, -28, -1, -42, -1, -31, -15, -20, -13, -55, -1, -22, -17, -50, -1, -54, -1, -40, -33, -26, -1, -76, -8, -43, more...

integer, non-monotonic, -

a(n)=n-σ(n)
σ(n)=divisor sum of n
n≥1
4 operations
Prime

Sequence uxsxpp5axe54p

0, 1, 1, 3, 1, 6, 1, 7, 4, 8, 1, 16, 1, 10, 9, 15, 1, 21, 1, 22, 11, 14, 1, 36, 6, 16, 13, 28, 1, 42, 1, 31, 15, 20, 13, 55, 1, 22, 17, 50, 1, 54, 1, 40, 33, 26, 1, 76, 8, 43, more...

integer, non-monotonic, +, A001065

a(n)=σ(n)-n
σ(n)=divisor sum of n
n≥1
4 operations
Prime

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