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 A070143 #11 Feb 16 2025 08:32:46 %S A070143 17,39,52,212,252,368,375,493,561,587,659,839,957,972,1156,1186,1196, %T A070143 1297,1582,1912,1955,1971,2115,2352,2555,2574,2713,3251,3473,3728, %U A070143 3746,4286,4298,4313,4319,4330,5251,5272,5378 %N A070143 Numbers n such that [A070080(n), A070081(n), A070082(n)] is an integer triangle with integer area, having relatively prime side lengths. %H A070143 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HeronianTriangle.html">Heronian Triangle</a>. %H A070143 R. Zumkeller, <a href="/A070080/a070080.txt">Integer-sided triangles</a> %Y A070143 Cf. A070142. %K A070143 nonn %O A070143 1,1 %A A070143 _Reinhard Zumkeller_, May 05 2002