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 A119295 #19 Jun 10 2019 00:48:38
%S A119295 0,27,311,3919,47647,628061,7098709,79587350,888504625,10169426048,
%T A119295 110936566287,1199775766812
%N A119295 Total number of 4's digits in the first 10^n primes.
%e A119295 At a(2)=27 there are 27 4's digits in the first 10^2 primes.
%p A119295 A119295 := proc(n) option remember: local k,s,lim: if(n=0)then return 0:fi: lim:=10^n: s:=procname(n-1): for k from 10^(n-1)+1 to lim do s:=s+nops([SearchAll("4",convert(ithprime(k),string))]): od: return s: end: seq(A119295(n),n=1..4); # _Nathaniel Johnston_, May 09 2011
%t A119295 Accumulate@Table[c = 0; For[i = 10^(n - 1) + 1, i <= 10^n, i++, c += Count[IntegerDigits[Prime[i]], 4]]; c, {n, 6}] (* _Robert Price_, Jun 09 2019 *)
%Y A119295 Cf. A119290, A119291-A119294, A119296-A119300.
%K A119295 more,nonn,base
%O A119295 1,2
%A A119295 _Enoch Haga_, May 13 2006
%E A119295 Offset changed from 0 to 1 by _Nathaniel Johnston_, May 09 2011
%E A119295 a(8)-a(11) from _Robert Price_, Nov 05 2013
%E A119295 a(12) from _Marek Hubal_, Mar 04 2019