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 A366651 #10 Jan 09 2024 18:46:53 %S A366651 1,2,2,4,3,4,3,6,3,6,4,8,4,6,6,9,5,6,4,11,6,8,4,12,7,7,6,12,6,11,3,12, %T A366651 8,10,10,12,6,8,9,15,5,11,5,14,10,8,6,17,5,13,8,16,8,12,10,17,7,10,6, %U A366651 21,5,7,9,15,8,15,6,19,9,20,7,18,7,12,14,16,9 %N A366651 Number of distinct prime divisors of 8^n - 1. %H A366651 Max Alekseyev, <a href="/A366651/b366651.txt">Table of n, a(n) for n = 1..500</a> %F A366651 a(n) = omega(8^n-1) = A001221(A024088(n)). %F A366651 a(n) = A046800(3*n). - _Max Alekseyev_, Jan 09 2024 %o A366651 (PARI) for(n = 1, 100, print1(omega(8^n - 1), ", ")) %Y A366651 Cf. A024088, A001221, A057953, A366652, A366653, A366654. %Y A366651 Cf. A046800, A133801, A366604, A366611, A366620, A366632, A366660, A102347, A366681, A366707. %K A366651 nonn %O A366651 1,2 %A A366651 _Sean A. Irvine_, Oct 15 2023