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 A239037 #8 Mar 09 2014 12:11:21 %S A239037 2,3,5,7,3,7,2,3,3,7,5,7,7,7,3,7,3,7,3,3,3,5,3,7,7,3,7,2,2,2,2,3,3,3, %T A239037 2,3,3,3,3,7,7,7,5,5,5,5,7,3,7,3,3,7,5,3,7,7,7,7,7,2,2,3,5,3,3,7,7,2, %U A239037 7,7,7,3,7,3,2,3,3,5,3,7,3,7,3,7,2,5,3,7,7,3,2,2,2,2,3,3,3,3,3,2,3,7,5,5,7,3,7,3,5,5,7,3,2,3,7,3,7,7,7,7,3,7,7,7,7,7,3,3,5,7,7,3,7,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2 %N A239037 a(n) = prime digit in A092621(n). %C A239037 From first 12000 terms, numbers of 2s, 3s, 5s, and 7s are: 2308, 3729, 2267, 3696. Note that numbers of 2s and 5s are very close to each other, and the same is for numbers of 3s and 7s. %Y A239037 Cf. A092621 %K A239037 nonn,base %O A239037 1,1 %A A239037 _Zak Seidov_, Mar 09 2014