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 A106502 #5 Mar 31 2012 10:26:04 %S A106502 4,7,9,9,11,16,24,13,25,15,25,32,17,49,36,19,49,57,40,49,21,49,64,23, %T A106502 81,69,48,81,25,64,75,27,104,81,56,121,29,81,100,87,121,144,31,120, %U A106502 121,93,64,100,155,33,121,144,169,121,165,35,136,169,105,121,72,37,169,111,169 %N A106502 Shortest side of primitive integer-sided triangle having an angle twice another, sorted on perimeter (A106499). %C A106502 Triple is (A106502,106503,106504). %Y A106502 Cf. A106499-A106506, A106410, A106420, A106430. %K A106502 nonn %O A106502 1,1 %A A106502 _Lekraj Beedassy_, May 04 2005 %E A106502 Corrected and extended by _Ray Chandler_, May 09 2005