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 A152274 #4 Jul 20 2015 03:47:32 %S A152274 1,2,29,359,3515,35666,361054,3647203,36746382,369719841,3715552230, %T A152274 37310055810,374416981198,3755522785108 %N A152274 Number of 2's among the digits of all n-digit primes. %Y A152274 Cf. A130817, A152272, A152273, A152275, A152276, A152277, A152278, A152279, A152280, A152281. %K A152274 base,nonn %O A152274 1,2 %A A152274 _Jon E. Schoenfield_, Dec 01 2008 %E A152274 a(12)-a(14) from _Giovanni Resta_, Jul 20 2015