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 A229462 #29 Aug 13 2017 08:09:33 %S A229462 7,15,28,60,112,240 %N A229462 Idoneal numbers (A000926) that are not pentagon exception numbers (A229461). %C A229462 See A229461. %C A229462 Idoneal numbers not of the form 7 or 15 times a square. - _Hugo Pfoertner_, Aug 13 2017 %H A229462 Eike Hertel, <a href="http://www.minet.uni-jena.de/preprints/hertel_13/Regdreipfla.pdf">Reguläre Dreieckspflasterungen konvexer Polygone</a>, Jenaer Schriften zur Mathematik und Informatik Math/Inf/01/13, 2013 (Preprint). %H A229462 Eike Hertel, Christian Richter, <a href="https://doi.org/10.1007/s00454-014-9576-7">Tiling Convex Polygons with Congruent Equilateral Triangles</a>, Discrete Comput Geom (2014) 51:753-759. %H A229462 MathOverflow, <a href="https://mathoverflow.net/questions/188977/which-natural-numbers-are-a-square-minus-a-sum-of-two-squares">Which natural numbers are a square minus a sum of two squares?</a>. Answer by user "Lucia", 2014 Dec 5. %Y A229462 Cf. A000926 (idoneal numbers), A229461 (pentagon exception numbers). %K A229462 nonn,fini,full %O A229462 1,1 %A A229462 Suggested by Eike Hertel, _Hugo Pfoertner_, Sep 24 2013