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 A366632 #13 Jan 20 2024 12:10:15 %S A366632 2,2,3,3,3,4,4,4,5,5,4,7,3,6,6,6,4,7,4,8,6,6,5,11,5,5,9,8,5,10,5,8,8, %T A366632 5,7,11,5,6,7,11,5,11,4,10,10,6,4,14,8,8,9,8,5,12,6,13,8,6,6,17,6,8,9, %U A366632 11,9,13,6,9,9,15,4,18,7,7,10,8,9,13,4,16,13 %N A366632 Number of distinct prime divisors of 7^n - 1. %H A366632 Max Alekseyev, <a href="/A366632/b366632.txt">Table of n, a(n) for n = 1..388</a> %F A366632 a(n) = omega(7^n-1) = A001221(A024075(n)). %o A366632 (PARI) for(n = 1, 100, print1(omega(7^n - 1), ", ")) %Y A366632 Cf. A024075, A001221, A057954, A059889, A074249, A218358, A366620, A366633, A366634, A366635. %Y A366632 Cf. A046800, A133801, A366604, A366611, A366620, A366651, A366660, A102347, A366681, A366707. %K A366632 nonn %O A366632 1,1 %A A366632 _Sean A. Irvine_, Oct 14 2023