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 A152281 #9 Jul 20 2015 03:54:44
%S A152281 0,6,61,579,5484,52015,500811,4873234,47639648,467715626,4606264916,
%T A152281 45472773167,449751152190,4454948367909
%N A152281 Number of 9's among the digits of all n-digit primes.
%t A152281 Table[Count[Flatten[IntegerDigits/@Prime[Range[PrimePi[10^i]+1,PrimePi[10^(i+1)]]]],9],{i,0,10}] (* _Harvey P. Dale_, Dec 08 2010 *)
%Y A152281 Cf. A130817, A152272, A152273, A152274, A152275, A152276, A152277, A152278, A152279, A152280.
%K A152281 base,nonn
%O A152281 1,2
%A A152281 _Jon E. Schoenfield_, Dec 01 2008
%E A152281 a(12)-a(14) from _Giovanni Resta_, Jul 20 2015