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 A137407 #6 Feb 03 2020 17:28:47 %S A137407 1,2,3,5,6,7,8,9,10,11,13,14,16,17,18,19,20,22,23,25,26,27,28,29,30, %T A137407 31,32,33,34,36,37,38,39,41,42,43,44,46,47,48,49,50,51,52,53,54,57,58, %U A137407 59,61,62,64,65,66,67,68,69,70,71,73,74,75,76,78,79,81,82,83,85,86,87,88 %N A137407 Numbers that cannot be the length of the long leg in any primitive Pythagorean triple. %C A137407 Complement of A024354. [_R. J. Mathar_, Sep 03 2009] %H A137407 Ray Chandler, <a href="/A137407/b137407.txt">Table of n, a(n) for n = 1..10000</a> %Y A137407 Cf. A137409, A020883. %K A137407 nonn %O A137407 1,2 %A A137407 _Vladimir Joseph Stephan Orlovsky_, Apr 14 2008, Aug 28 2009 %E A137407 Definition reworded by _R. J. Mathar_, Sep 03 2009