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 A366637 #12 Jan 20 2024 12:22:10
%S A366637 2,4,6,8,4,16,24,16,8,16,32,16,32,16,12,64,8,8,48,16,16,128,48,8,16,
%T A366637 32,24,32,64,8,512,32,16,128,48,1024,256,16,12,256,64,64,96,512,32,
%U A366637 2048,96,8,64,2048,640,128,32,64,384,3072,256,256,96,64,512,8,48
%N A366637 Number of divisors of 7^n+1.
%H A366637 Max Alekseyev, <a href="/A366637/b366637.txt">Table of n, a(n) for n = 0..387</a>
%F A366637 a(n) = sigma0(7^n+1) = A000005(A034491(n)).
%e A366637 a(4)=4 because 7^4+1 has divisors {1, 2, 1201, 2402}.
%p A366637 a:=n->numtheory[tau](7^n+1):
%p A366637 seq(a(n), n=0..100);
%t A366637 DivisorSigma[0, 7^Range[0, 62] + 1] (* _Paul F. Marrero Romero_, Oct 16 2023 *)
%o A366637 (PARI) a(n) = numdiv(7^n+1);
%Y A366637 Cf. A034491, A000005, A057937, A227575, A366633, A366636, A366638, A366639.
%Y A366637 Cf. A046798, A366577, A366606, A366616, A366628, A366656, A366665, A344897, A366688, A366714.
%K A366637 nonn
%O A366637 0,1
%A A366637 _Sean A. Irvine_, Oct 15 2023