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 A195689 #5 Mar 30 2012 18:57:48 %S A195689 5,17,53,3545,8369,823633,499025,669937733,722651597,35034942905, %T A195689 173113684537,1860490554949,21906189996125,2320160748906089, %U A195689 1347255903779016125,49174444344033218405,436006592777392918253129,31471103940926430492910889 %N A195689 Hypotenuses of primitive Pythagorean triples in A195687 and A195688. %C A195689 See A195500 for discussion and list of related sequences; see A195687 for Mathematica program. %Y A195689 Cf. A195500, A195687, A195688. %K A195689 nonn %O A195689 1,1 %A A195689 _Clark Kimberling_, Sep 22 2011