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