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 A113489 #31 Sep 27 2016 13:09:18
%S A113489 129,3682913,496165411,62260698721,7472966967499,99262851056183695,
%T A113489 1234379338586942892505,135436174616790289414111,
%U A113489 14738971133550183905879827,1593061976858155930556059673,171191473337951767580578821529,18305009217958957209544913346089
%N A113489 Composite numbers of the form "Sum of the first 10^k primes".
%H A113489 David Baugh, <a href="/A113489/b113489.txt">Table of n, a(n) for n = 1..18</a>
%e A113489 The first 10^10 primes add up to 1234379338586942892505, which is composite.
%t A113489 Select[{ (* list A099824 *) }, ! PrimeQ[#] &] (* _Robert G. Wilson v_, Jan 14 2006 *)
%Y A113489 Composite terms of A099824.
%K A113489 nonn
%O A113489 1,1
%A A113489 _Cino Hilliard_, Jan 09 2006
%E A113489 Terms a(8) and beyond from _David Baugh_, Sep 27 2016