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 A097263 #4 Feb 16 2025 08:32:54 %S A097263 1,3,7,1,7,9,3,11,5,9,1,15,17,1,11,13,19,5,13,3,3,15,9,7,23,23,25,7, %T A097263 21,11,3,21,21,27,5,17,25,7,17,31,7,1,15,17,1,33,27,21,3,3,19,29,29, %U A097263 13,19,35,23,31,9,33,39,25,7,9,39,7,9,29,35,37,13,19,5,27,21,27,11,21,43,23 %N A097263 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 odd leg values. %C A097263 One of a,b,c is odd, other two are even for primitive Pythagorean quadruples. %H A097263 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PythagoreanQuadruple.html">Pythagorean Quadruple.</a> %Y A097263 Cf. A096907, A096908, A096909. %K A097263 nonn %O A097263 1,2 %A A097263 _Ray Chandler_, Aug 15 2004