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 A358226 #7 Nov 25 2022 11:10:39
%S A358226 1,3,11,15,17,25,27,31,43,51,57,59,63,71,75,77,83,85,87,93,95,103,105,
%T A358226 107,109,115,119,129,133,137,139,145,147,151,157,167,169,171,173,175,
%U A358226 177,185,189,191,199,201,207,211,213,215,217,221,223,229,233,235,237,241,257,259,263,269,281,289,299,303,305,307
%N A358226 Numbers k such that A276086(k) mod k is an even number, where A276086 is the primorial base exp-function.
%C A358226 All terms are odd.
%H A358226 <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>
%F A358226 {k | A328386(k) == 0 (mod 2)}.
%o A358226 (PARI)
%o A358226 A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };
%o A358226 A358224(n) = ((A276086(n)%n)%2);
%o A358226 isA358226(n) = !A358224(n);
%Y A358226 Cf. A276086, A328386, A328387 (subsequence), A358225 (complement).
%Y A358226 Positions of zeros in A358224.
%Y A358226 Cf. also A358229.
%K A358226 nonn
%O A358226 1,2
%A A358226 _Antti Karttunen_, Nov 25 2022