A366715 Sum of the divisors of 12^n+1.

3, 14, 180, 2240, 21060, 267988, 3706920, 38773952, 459970056, 6692483840, 79425033660, 800162860756, 9101898907920, 117326869641600, 1596198064568400, 20655000929239040, 184885459808838660, 2390210102271311936, 33504016991491136160, 344201347103878781440

Offset

0,1

Links

Max Alekseyev, Table of n, a(n) for n = 0..306

Formula

a(n) = sigma(12^n+1) = A000203(A178248(n)).

Example

a(4)=21060 because 12^4+1 has divisors {1, 89, 233, 20737}.

Maple

a:=n->numtheory[sigma](12^n+1):
seq(a(n), n=0..100);

Crossrefs

Cf. A178248, A000203, A366710, A366712, A366713, A366714, A366716, A366719, A366720, A366689.

Sequence in context: A220438 A250001 A288559 * A132490 A344745 A058388

Adjacent sequences: A366712 A366713 A366714 * A366716 A366717 A366718

Keyword

nonn

Author

Sean A. Irvine, Oct 17 2023

Status

approved