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 A353486 #14 Apr 25 2022 08:10:55
%S A353486 1,2,3,2,1,2,1,2,3,2,1,2,1,2,3,2,1,2,1,2,3,2,1,2,1,2,3,2,1,2,3,2,1,2,
%T A353486 3,2,3,2,1,2,3,2,3,2,1,2,3,2,3,2,1,2,3,2,3,2,1,2,3,2,1,2,3,2,1,2,1,2,
%U A353486 3,2,1,2,1,2,3,2,1,2,1,2,3,2,1,2,1,2,3,2,1,2,3,2,1,2,3,2,3,2,1,2,3,2,3,2,1,2
%N A353486 Primorial base exp-function reduced modulo 4.
%C A353486 There are no zeros because A276086 is a permutation of A048103.
%H A353486 Antti Karttunen, <a href="/A353486/b353486.txt">Table of n, a(n) for n = 0..65537</a>
%H A353486 <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>
%F A353486 a(n) = A010873(A276086(n)).
%F A353486 For n >= 1, a(n) = A010873(A353516(n) * A353526(n)).
%F A353486 For all n >= 0, a(2n) = A353487(n), a(2n+1) = 2.
%o A353486 (PARI)
%o A353486 A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };
%o A353486 A353486(n) = (A276086(n)%4);
%Y A353486 Cf. A010873, A048103, A276086, A353488, A353489, A353516, A353526.
%Y A353486 Cf. A007395, A353487 (bisections).
%K A353486 nonn,base
%O A353486 0,2
%A A353486 _Antti Karttunen_, Apr 24 2022