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 A152277 #4 Jul 20 2015 03:50:24 %S A152277 1,2,30,327,3456,35095,357105,3619716,36527939,367918469,3700831147, %T A152277 37186789514,373373251387,3746568191964 %N A152277 Number of 5's among the digits of all n-digit primes. %Y A152277 Cf. A130817, A152272, A152273, A152274, A152275, A152276, A152278, A152279, A152280, A152281. %K A152277 base,nonn %O A152277 1,2 %A A152277 _Jon E. Schoenfield_, Dec 01 2008 %E A152277 a(12)-a(14) from _Giovanni Resta_, Jul 20 2015