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 A120276 #9 Sep 16 2015 09:18:32
%S A120276 2,19,29,67
%N A120276 Prime numbers p such that p divides the sum of squares of Catalan numbers A094639(p).
%C A120276 Next term is bigger than 2000. - _Stefan Steinerberger_, Jul 21 2006
%t A120276 Select[Prime[Range[303]], IntegerQ[Sum[(Binomial[2n,n]/(n + 1))^2, {n, 0, #}]/# ] &] (* _Stefan Steinerberger_, Jul 21 2006 *)
%Y A120276 Cf. A094639.
%K A120276 nonn
%O A120276 1,1
%A A120276 _Alexander Adamchuk_, Jul 04 2006