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 A309146 #7 Jul 14 2019 11:56:42 %S A309146 2,11,74,854 %N A309146 Least k such that the rank of the elliptic curve y^2 = x^3 + (k^2 - 6*k - 3)*x^2 + 16*k*x is n. %H A309146 Allan J. MacLeod, <a href="http://web.archive.org/web/20100125135648/http://maths.paisley.ac.uk/allanm/ECRNT/knight/knintro.htm">Knight's Problem</a> %Y A309146 Cf. A309142, A309147. %K A309146 nonn,more %O A309146 0,1 %A A309146 _Seiichi Manyama_, Jul 14 2019