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 A366615 #13 Apr 06 2025 15:43:51
%S A366615 1,2,2,3,2,3,3,4,3,4,4,5,3,4,3,6,3,4,5,5,4,8,4,4,4,5,4,7,3,4,7,5,4,8,
%T A366615 6,7,6,5,4,7,5,6,6,6,3,8,3,5,5,7,7,9,5,5,6,7,7,8,3,6,6,6,4,13,4,8,7,3,
%U A366615 7,8,7,5,6,5,5,12,5,9,9,6,6,10,6,5,7,9
%N A366615 Number of distinct prime divisors of 5^n + 1.
%H A366615 Max Alekseyev, <a href="/A366615/b366615.txt">Table of n, a(n) for n = 0..471</a>
%F A366615 a(n) = omega(5^n+1) = A001221(A034474(n)).
%t A366615 Table[PrimeNu[5^n+1],{n,0,90}] (* _Harvey P. Dale_, Apr 06 2025 *)
%o A366615 (PARI) for(n = 0, 100, print1(omega(5^n + 1), ", "))
%Y A366615 Cf. A001221, A034474, A057939, A074478, A366611, A366616, A366617, A366618.
%Y A366615 Cf. A046799, A366580, A366605, A366627, A366636, A366655, A366664, A119704, A366686, A366712.
%K A366615 nonn
%O A366615 0,2
%A A366615 _Sean A. Irvine_, Oct 14 2023