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 A328318 #15 Oct 14 2019 13:55:21
%S A328318 0,1,1,2,1,2,1,3,5,16,104,7447
%N A328318 Number of nonzero digits in representation of A328316(n) in primorial base; Number of distinct prime factors in A328316(1+n).
%H A328318 <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>
%F A328318 a(n) = A267263(A328316(n)).
%F A328318 a(n) = A001221(A328316(1+n)).
%o A328318 (PARI)
%o A328318 A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };
%o A328318 A328316(n) = if(!n,0,A276086(A328316(n-1)));
%o A328318 A267263(n) = { my(s=0, p=2, d); while(n, d = (n%p); s += !!d; n = (n-d)/p; p = nextprime(1+p)); (s); };
%o A328318 A328318(n) = A267263(A328316(n));
%o A328318 \\ Or alternatively, more slowly as:
%o A328318 A328318(n) = omega(A328316(1+n));
%Y A328318 Cf. A001221, A267263, A276086, A328316, A328317, A328319.
%K A328318 nonn,base,hard,more
%O A328318 0,4
%A A328318 _Antti Karttunen_, Oct 14 2019