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 A309145 #8 Jul 14 2019 11:56:34 %S A309145 28,52,59,70,76,101,103,108,115,122,130,139,148,164,172,180,181,190, %T A309145 199,208,210,220,222,223,228,268,270,284,314,316,327,328,339,340,364, %U A309145 376,388,398,403,420,427,430,436,443,446,448,456,457,460,480,487,490,504,521,532,540 %N A309145 Numbers k for which rank of the elliptic curve y^2=x^3+(k^2+6*k-3)*x^2-16*k*x is 2. %H A309145 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> %F A309145 A309144(a(n)) = 2. %o A309145 (PARI) for(k=1, 1e3, if(ellanalyticrank(ellinit([0, k^2+6*k-3, 0, -16*k, 0]))[1]==2, print1(k", "))) %Y A309145 Cf. A309144. %K A309145 nonn %O A309145 1,1 %A A309145 _Seiichi Manyama_, Jul 14 2019