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 A178221 #9 Feb 14 2018 15:03:25
%S A178221 37550402023,142913828922,312471072265,544501644261,838596693108,
%T A178221 1192390967254,1607061425171,2080483502248,2613521583098,
%U A178221 3203324994356,3853640069780,4561368404019,5326234575619,6147376715980,7026422648071
%N A178221 Sum of the primes < n*10^6.
%H A178221 Robert G. Wilson v, <a href="/A178221/b178221.txt">Table of n, a(n) for n = 1..10000</a>
%t A178221 k = 1; p = 2; s = 0; lst = {}; While[k < 16, While[p < 10^6*k, s = s + p; p = NextPrime@ p]; k++; AppendTo[lst, s]]; lst
%Y A178221 Cf. A046731, A130739.
%K A178221 nonn
%O A178221 1,1
%A A178221 _Robert G. Wilson v_, Jul 21 2010