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 A331223 #10 Jan 13 2020 15:20:01 %S A331223 3,15,3,35,32,1,20,63,15,55,3,4,99,96,39,91,84,3,143,7,35,5,64,8,119, %T A331223 1,51,255,195,192,96,187,180,95,171,160,3135,255,5,63,3,3,247,15,15, %U A331223 231,132,55,207,1760,323,11,320,35,115,8855,308,3,299,20 %N A331223 a(n) = denominator of squared radius R^2 of the circumcircle of the n-th non-obtuse triangle with integer sides i <= j <= k <= sqrt(i^2 + j^2) in a list of such triangles, the list being sorted by increasing size of R. Numerators are A331222. %C A331223 See A331222. %e A331223 See A331222. %Y A331223 Cf. A331222, A331227, A331228. %K A331223 nonn,frac %O A331223 1,1 %A A331223 _Hugo Pfoertner_, Jan 12 2020