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 A231792 #8 May 21 2014 17:10:59
%S A231792 1,15,292,3365,39360,464466,5262871,56702805,607358478,6463119473,
%T A231792 68932485429
%N A231792 Count of the first 10^n primes containing at least one 5's digit.
%F A231792 a(n) ~ 10^n. - _Charles R Greathouse IV_, May 21 2014
%e A231792 a(2)=15 because there are 15 primes not greater than 541 (the 100th prime) that contain a 5's digit. Namely: 5, 53 59, 151, 157, 251, 257, 353, 359, 457, 503, 509, 521, 523, 541.
%t A231792 cnt = 0; Table[Do[p = Prime[k]; If[MemberQ[IntegerDigits[p], 5], cnt++], {k, 10^(n - 1) + 1, 10^n}]; cnt, {n, 5}] (* _T. D. Noe_, Nov 13 2013 *)
%Y A231792 Cf. A231726-A231790, A231792-A231796, A091634-A091643, A231412, A228413-A228421.
%K A231792 more,nonn,base
%O A231792 1,2
%A A231792 _Robert Price_, Nov 13 2013