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 A366629 #17 Apr 20 2025 20:12:34
%S A366629 3,8,38,256,1298,9792,52136,338580,1778436,11889152,62367272,
%T A366629 414625216,2178461956,15224775552,80673299432,611106029568,
%U A366629 2830769440776,19344856702976,115255634181184,696800841097536,3748220725527432,27388329197137920,135183433256806480
%N A366629 Sum of the divisors of 6^n+1.
%H A366629 Max Alekseyev, <a href="/A366629/b366629.txt">Table of n, a(n) for n = 0..430</a>
%F A366629 a(n) = sigma(6^n+1) = A000203(A062394(n)).
%e A366629 a(3)=256 because 6^3+1 has divisors {1, 7, 31, 217}.
%p A366629 a:=n->numtheory[sigma](6^n+1):
%p A366629 seq(a(n), n=0..100);
%t A366629 DivisorSigma[1, 6^Range[0, 30] + 1] (* _Paolo Xausa_, Jul 03 2024 *)
%Y A366629 Cf. A062394, A000203, A057938, A366622, A366617, A366627, A366628, A366630, A366670.
%Y A366629 Cf. A069061, A366578, A366607, A366638, A366657, A366666, A366668, A366689, A366715.
%K A366629 nonn
%O A366629 0,1
%A A366629 _Sean A. Irvine_, Oct 14 2023