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 A081985 #10 Jan 25 2020 15:38:43 %S A081985 17,29,37,53,65,73,85,101,109,125,145,137,173,197,185,205,229,221,257, %T A081985 241,265,293,281,325,305,325,365,349,401,377,373,409,397,445,485,457, %U A081985 449,493,533,509,577,505,545,533,565,629,565,601,677,593,641,625,685 %N A081985 Hypotenuses of primitive Pythagorean triangles with even short leg (or odd long leg) sorted on semiperimeter. %H A081985 Ray Chandler, <a href="/A081985/b081985.txt">Table of n, a(n) for n = 1..10000</a> %K A081985 nonn %O A081985 1,1 %A A081985 _Lekraj Beedassy_, Apr 23 2003 %E A081985 More terms from _Ray Chandler_, Oct 28 2003