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 A097265 #4 Feb 16 2025 08:32:54 %S A097265 2,6,4,8,6,6,12,10,14,12,12,10,6,18,16,16,8,20,18,18,22,16,20,22,10, %T A097265 14,10,26,16,24,24,18,22,14,30,20,20,28,28,8,32,32,26,30,30,10,24,28, %U A097265 28,36,26,22,26,34,34,14,24,24,32,24,12,30,30,38,18,42,42,28,28,20,40,40 %N A097265 Primitive Pythagorean Quadruples a^2+b^2+c^2=d^2, 0<a<=b<=c<=d, gcd(a,b,c,d)=1, sorted by d, then c, then b; sequence gives long even leg values. %C A097265 One of a,b,c is odd, other two are even for primitive Pythagorean quadruples. %H A097265 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PythagoreanQuadruple.html">Pythagorean Quadruple.</a> %Y A097265 Cf. A096907, A096908, A096909. %K A097265 nonn %O A097265 1,1 %A A097265 _Ray Chandler_, Aug 15 2004