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 A366715 Sum of the divisors of 12^n+1. 13
 3, 14, 180, 2240, 21060, 267988, 3706920, 38773952, 459970056, 6692483840, 79425033660, 800162860756, 9101898907920, 117326869641600, 1596198064568400, 20655000929239040, 184885459808838660, 2390210102271311936, 33504016991491136160, 344201347103878781440 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified September 17 05:28 EDT 2024. Contains 375985 sequences. (Running on oeis4.)