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 A366611 #11 Jan 11 2024 15:44:37 %S A366611 1,2,2,3,3,4,2,4,4,5,2,6,2,5,6,6,3,7,4,8,5,6,3,8,7,5,8,7,4,11,3,8,5,6, %T A366611 8,11,4,8,5,11,3,12,3,9,11,6,2,11,3,11,7,8,4,14,8,9,6,7,3,17,4,7,10, %U A366611 11,7,12,6,11,8,14,3,16,4,8,15,11,6,11,4,15 %N A366611 Number of distinct prime divisors of 5^n - 1. %H A366611 Max Alekseyev, <a href="/A366611/b366611.txt">Table of n, a(n) for n = 1..502</a> %F A366611 a(n) = omega(5^n-1) = A001221(A024049(n)). %o A366611 (PARI) for(n = 1, 100, print1(omega(5^n - 1), ", ")) %Y A366611 Cf. A024049, A001221, A057956, A059887, A074479, A143665, A218357, A295502, A366612, A366613. %Y A366611 Cf. A046800, A133801, A366604, A366620, A366632, A366651, A366660, A102347, A366681, A366707. %K A366611 nonn %O A366611 1,2 %A A366611 _Sean A. Irvine_, Oct 14 2023