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 A336352 #8 Jul 20 2020 02:08:57 %S A336352 0,1,0,1,0,0,0,2,1,0,0,1,0,0,0,1,0,1,0,1,0,0,0,1,1,0,1,0,0,0,0,2,0,0, %T A336352 0,2,0,0,0,0,0,0,0,0,1,0,0,1,1,1,0,0,0,1,0,0,0,0,0,1,0,0,1,1,0,0,0,0, %U A336352 0,0,0,2,0,0,1,0,0,0,0,1,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,1,1,2,0,0,0,0,0 %N A336352 Number of prime divisors of sigma(n) that are larger than the largest prime factor of n; a(1) = 0. %H A336352 Antti Karttunen, <a href="/A336352/b336352.txt">Table of n, a(n) for n = 1..65537</a> %H A336352 <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a> %F A336352 For all n >= 1, a(n) <= A058062(n). %o A336352 (PARI) A336352(n) = if(1==n,0,my(gp=vecmax(factor(n)[, 1])); #select(p -> (p>gp), factor(sigma(n))[, 1])); %Y A336352 Cf. A000203, A006530, A058062, A336353 (positions of zeros). %K A336352 nonn %O A336352 1,8 %A A336352 _Antti Karttunen_, Jul 19 2020