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 A195540 #5 Mar 30 2012 18:57:48 %S A195540 13,37,433,1261,14701,42841,499393,1455337,16964653,49438621, %T A195540 576298801,1679457781,19577194573,57052125937,665048316673, %U A195540 1938092824081,22592065572301,65838103892821,767465181141553,2236557439531837,26071224093240493 %N A195540 Hypotenuses of primitive Pythagorean triples in A195538 and A195539. %C A195540 See A195500 for discussion and list of related sequences; see A195538 for Mathematica program. %Y A195540 Cf. A195500, A195538, A195539. %K A195540 nonn %O A195540 1,1 %A A195540 _Clark Kimberling_, Sep 20 2011