A031160 -id:A031160 - cp's OEIS frontend

A348769 Number of divisors of A031160(n).

2, 4, 4, 6, 6, 6, 4, 8, 4, 8, 4, 6, 12, 6, 14, 12, 6, 12, 8, 8, 8, 6, 4, 12, 12, 16, 12, 12, 16, 4, 6, 18, 12, 8, 8, 20, 4, 8, 4, 20, 10, 4, 6, 4, 14, 16, 4, 8, 8, 8, 16, 4, 6, 8, 6, 6, 4, 6, 8, 4, 16, 8, 6, 8, 16, 12, 6, 8, 8, 18, 8, 18, 6, 12, 8, 4, 8, 8, 12

Offset: 1

N. J. A. Sloane, Nov 06 2021, following an email discussion with Robert C. Lyons

nonn

Amiram Eldar, Table of n, a(n) for n = 1..10000

Cf. A000005, A031160, A348770, A348772.

Suggested by A078574.

a(n) = A000005(A031160(n)). - Omar E. Pol, Feb 12 2022

More terms from Amiram Eldar, Feb 12 2022

A348770 Sum of divisors of A031160(n).

Original entry on oeis.org

3, 15, 24, 63, 93, 126, 114, 255, 204, 324, 294, 420, 588, 504, 762, 855, 756, 1008, 930, 912, 1020, 921, 924, 1344, 1344, 1680, 1596, 1764, 2040, 1392, 1638, 2394, 2016, 1836, 1776, 2604, 1644, 1920, 1806, 2976, 2343, 1896, 2436, 2130, 3048, 3240, 2256

Offset: 1

N. J. A. Sloane, Nov 06 2021, following an email discussion with Robert C. Lyons

nonn

Amiram Eldar, Table of n, a(n) for n = 1..10000

Cf. A000203, A031160, A348769.

a(n) = A000203(A031160(n)). - Omar E. Pol, Feb 12 2022

A348771 a(n) = A031160(n)/2.

Original entry on oeis.org

1, 4, 7, 16, 25, 34, 37, 64, 67, 85, 97, 118, 130, 142, 160, 196, 214, 238, 244, 259, 268, 289, 307, 310, 322, 364, 370, 442, 448, 463, 466, 490, 496, 505, 511, 520, 547, 553, 601, 616, 625, 631, 694, 709, 736, 748, 751, 772, 793, 799, 820, 883, 886, 916, 961

Offset: 1

N. J. A. Sloane, Nov 06 2021

nonn

Amiram Eldar, Table of n, a(n) for n = 1..10000

Cf. A000959, A031158, A031159, A031160.

More terms from Amiram Eldar, Mar 09 2022

A031158 Twin lucky numbers (lower terms).

Original entry on oeis.org

1, 7, 13, 31, 49, 67, 73, 127, 133, 169, 193, 235, 259, 283, 319, 391, 427, 475, 487, 517, 535, 577, 613, 619, 643, 727, 739, 883, 895, 925, 931, 979, 991, 1009, 1021, 1039, 1093, 1105, 1201, 1231, 1249, 1261, 1387, 1417, 1471, 1495, 1501

Offset: 1

Patrick De Geest

nonn

Amiram Eldar, Table of n, a(n) for n = 1..10000

Cf. A000959, A031158, A031159, A031160.

A031159 Twin lucky numbers (upper terms).

Original entry on oeis.org

3, 9, 15, 33, 51, 69, 75, 129, 135, 171, 195, 237, 261, 285, 321, 393, 429, 477, 489, 519, 537, 579, 615, 621, 645, 729, 741, 885, 897, 927, 933, 981, 993, 1011, 1023, 1041, 1095, 1107, 1203, 1233, 1251, 1263, 1389, 1419, 1473, 1497, 1503

Offset: 1

Patrick De Geest

nonn

Amiram Eldar, Table of n, a(n) for n = 1..10000

Cf. A000959, A031158, A031159, A031160.

Offset corrected by Amiram Eldar, Nov 15 2019

A348772 a(n) = A348769(n)/2.

Original entry on oeis.org

1, 2, 2, 3, 3, 3, 2, 4, 2, 4, 2, 3, 6, 3, 7, 6, 3, 6, 4, 4, 4, 3, 2, 6, 6, 8, 6, 6, 8, 2, 3, 9, 6, 4, 4, 10, 2, 4, 2, 10, 5, 2, 3, 2, 7, 8, 2, 4, 4, 4, 8, 2, 3, 4, 3, 3, 2, 3, 4, 2, 8, 4, 3, 4, 8, 6, 3, 4, 4, 9, 4, 9, 3, 6, 4, 2, 4, 4, 6, 6, 8, 3, 6, 6, 2, 4, 4

Offset: 1

N. J. A. Sloane, Nov 06 2021

nonn

Amiram Eldar, Table of n, a(n) for n = 1..10000

Cf. A031160, A348769.

More terms from Amiram Eldar, Mar 09 2022

cp's OEIS Frontend

A348769 Number of divisors of A031160(n).

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A348770 Sum of divisors of A031160(n).

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Formula

A348771 a(n) = A031160(n)/2.

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A031158 Twin lucky numbers (lower terms).

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A031159 Twin lucky numbers (upper terms).

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Extensions

A348772 a(n) = A348769(n)/2.

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