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 A333239 #17 Sep 24 2021 01:26:57
%S A333239 1,6,3,2,5,0,5,4,0,2,9,0,2,5,1,3,0,7,9,0,1,0,3,6,6,2,5,8,9,3,5,5,3,7,
%T A333239 6,0,4,9,7,2,0,1,1,3,0,0,4,4,3,2,6,2,9,2,6,5,3,1,4,2,0,3,2,4,4,2,6,7,
%U A333239 5,7,4,6,2,7,2,5,4,0,6,0,9,2,4,1,3,2,7,0,4,2,3,9,0,3,3,8,4,0
%N A333239 Decimal expansion of lim_{n->infinity} (Product_{k=1..n} p(k)^2 / Product_{k=1..n} (p(k)^2 - 1)) where p(k) = A167135(k) are the primes with p mod 12 != 1.
%F A333239 A301430 = sqrt(A333239)*A333304.
%e A333239 1.63250540290251307901036625893553760497201130044326292653142032442675746272540...
%Y A333239 Cf. A167135, A301430, A333304, A333240.
%K A333239 nonn,cons,hard
%O A333239 1,2
%A A333239 _Peter Luschny_, May 13 2020