This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A366622 #11 Apr 15 2025 22:22:16
%S A366622 6,48,264,1824,9672,67584,335928,2367552,13031040,94708224,454285152,
%T A366622 3523559424,15677418768,113738502240,599516366592,4210539708672,
%U A366622 20465720064000,154928015278080,735060126170880,5906693566844928,26937015875831424,188358079273592832
%N A366622 Sum of the divisors of 6^n-1.
%H A366622 Max Alekseyev, <a href="/A366622/b366622.txt">Table of n, a(n) for n = 1..430</a>
%F A366622 a(n) = sigma(6^n-1) = A000203(A024062(n)).
%e A366622 a(4)=1824 because 6^4-1 has divisors {1, 5, 7, 35, 37, 185, 259, 1295}.
%p A366622 a:=n->numtheory[sigma](6^n-1):
%p A366622 seq(a(n), n=1..100);
%t A366622 DivisorSigma[1, 6^Range[30]-1]
%Y A366622 Cf. A024062, A000203, A057955, A059888, A274907, A366620, A366621, A366623, A366629.
%Y A366622 Cf. A075708, A366576, A366603, A366613, A366634, A366653, A366662, A102146, A366684, A366710.
%K A366622 nonn
%O A366622 1,1
%A A366622 _Sean A. Irvine_, Oct 14 2023