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 A119300 #30 Mar 04 2019 10:38:36
%S A119300 2,33,431,6318,72062,806674,9004550,104220797,1131743629,12266783460,
%T A119300 131900123107,1447662128808
%N A119300 Total number of 9's digits in the first 10^n primes.
%e A119300 At a(3)=431 there are 431 9's digits in the first 10^3 = 1000 primes.
%p A119300 A119300 := 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("9",convert(ithprime(k),string))]): od: return s: end: seq(A119300(n),n=1..4); # _Nathaniel Johnston_, May 09 2011
%t A119300 cnt=0; k=0; Table[While[k++; cnt=cnt+DigitCount[Prime[k], 10, 9];k < 10^n]; cnt, {n, 5}] (* _T. D. Noe_, May 10 2011 *)
%Y A119300 Cf. A119290, A119291-A119299.
%K A119300 more,nonn,base
%O A119300 1,1
%A A119300 _Enoch Haga_, May 13 2006
%E A119300 a(8)-a(11) from _Robert Price_, Nov 05 2013
%E A119300 a(12) from _Marek Hubal_, Mar 04 2019