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 A231597 #12 Jun 16 2019 14:20:52
%S A231597 0,2,30,351,3690,38541,394398,3998411,40399778,407316676,4099892369,
%T A231597 41217744252,414006129652,4155543234392
%N A231597 Total number of 8's digits in primes less than 10^n.
%e A231597 a(2)=2, since there are 2 8's in primes less than 100. Namely: 83, 89.
%t A231597 Table[Count[IntegerDigits[Prime[Range[PrimePi[10^n - 1]]]], 8, 2], {n, 7}] (* _Robert Price_, Jun 16 2019 *)
%Y A231597 Cf. A231411, A231590-A231598, A119290, A119291-A119300.
%K A231597 more,nonn,base
%O A231597 1,2
%A A231597 _Robert Price_, Nov 11 2013
%E A231597 a(14) from _Giovanni Resta_, Jul 20 2015