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 A073224 #22 Jun 22 2025 16:27:27
%S A073224 27,1465,92041,6554833,504813055,40947676475,3442465670223,
%T A073224 296935715374179,26108021958592999,2329702677873323273,
%U A073224 210338403560373373799,19172323465486902000641,1761408925012566646647345,162904914369466264400189781,15152171905761023446344720303
%N A073224 Partial sum of Pi(k) from 1 to 10^n.
%H A073224 Hiroaki Yamanouchi, <a href="/A073224/b073224.txt">Table of n, a(n) for n = 1..20</a>
%F A073224 a(n) = (10^n + 1) * A006880(n) - A046731(n). - _Hiroaki Yamanouchi_, Jul 06 2014
%t A073224 s = 0; k = 1; Do[ While[ k <= 10^n, s = s + PrimePi[k]; k++ ]; Print[s], {n, 1, 8}]
%Y A073224 Cf. A000720, A006880, A046731.
%K A073224 nonn
%O A073224 1,1
%A A073224 _Robert G. Wilson v_, Jul 20 2002
%E A073224 a(9)-a(10) from _Donovan Johnson_, Dec 15 2009
%E A073224 a(11)-a(12) from _Donovan Johnson_, Mar 19 2011
%E A073224 a(13)-a(14) from _Hiroaki Yamanouchi_, Jul 06 2014