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A245028 Divisors of 11^12 - 1. 2
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 18, 19, 20, 21, 24, 26, 28, 30, 35, 36, 37, 38, 39, 40, 42, 45, 48, 52, 56, 57, 60, 61, 63, 65, 70, 72, 74, 76, 78, 80, 84, 90, 91, 95, 104, 105, 111, 112, 114, 117, 120, 122, 126, 130, 133, 140, 144, 148, 152 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See Comments section in A245027.

The following 36 triangular numbers belong to this sequence: 1, 3, 6, 10, 15, 21, 28, 36, 45, 78, 91, 105, 120, 171, 190, 210, 630, 666, 703, 741, 780, 1596, 1830, 4095, 4560, 5460, 6216, 16653, 33670, 46360, 103740, 115440, 221445, 274170, 365085, 392303547090.

The following terms of A001082 (without 1, 21 and 120, which appear in the previous list) are in sequence: 5, 8, 16, 40, 56, 65, 133, 208, 280, 456, 481, 560, 936, 1008, 1281, 1365, 1680, 1776, 1976, 4880, 5985, 10920, 11285, 44408, 47880, 590520, 658008, 731120, 973560, 1046142792240.

Also, 4/5 of the members are divisible by 3 and 2/3 of them are even.

LINKS

Bruno Berselli, Table of n, a(n) for n = 1..1920

Index entries for sequences related to divisors of numbers

EXAMPLE

3138428376720 = 2^4 * 3^2 * 5 * 7 * 13 * 19 * 37 * 61 * 1117.

MATHEMATICA

Divisors[11^12 - 1]

PROG

(PARI) divisors(11^12-1)

(Sage) divisors(11^12-1)

(MAGMA) Divisors(11^12-1);

(Maxima) divisors(11^12-1);

CROSSREFS

Cf. Divisors of k^12-1: A003524 (k=2); A003532 (k=4); A245027 (k=7), A003543 (k=8), A027902 (k=9), A027897 (k=10).

Sequence in context: A072226 A247809 A247802 * A074402 A233264 A198343

Adjacent sequences:  A245025 A245026 A245027 * A245029 A245030 A245031

KEYWORD

nonn,fini,full

AUTHOR

Bruno Berselli, Jul 10 2014

STATUS

approved

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Last modified March 30 19:28 EDT 2020. Contains 333127 sequences. (Running on oeis4.)