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 A081934 #10 Jan 21 2020 12:21:36 %S A081934 15,21,35,45,55,63,77,91,99,105,117,143,153,165,171,187,195,209,221, %T A081934 231,247,253,255,273,275,285,299,323,325,345,351,357,377,391,399,403, %U A081934 425,435,437,459,465,475,483,493,513,525,527,551,561,575,589,595,609,621 %N A081934 Ordered odd long legs of primitive Pythagorean triangles. %H A081934 Ray Chandler, <a href="/A081934/b081934.txt">Table of n, a(n) for n = 1..10000</a> %Y A081934 Cf. A020883. %K A081934 nonn %O A081934 1,1 %A A081934 _Lekraj Beedassy_, Apr 23 2003 %E A081934 More terms from _Ray Chandler_, Oct 29 2003