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 A009560 #11 Aug 09 2021 20:08:20 %S A009560 1,2,5,25,32,71,2745,10623,63201,85868,369119,1039161,2285297, %T A009560 52962021,66998865,315796805,336125877,415074643,834972771,1309750075, %U A009560 1617454215,2056836133,5455816485,9030058217,10622144467,237371071725,341296396624 %N A009560 Numbers k that divide the sum of all primes <= k. %K A009560 nonn %O A009560 1,2 %A A009560 _David W. Wilson_ %E A009560 a(16)-a(27) from _Donovan Johnson_, Apr 23 2010