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 A309164 #12 Jul 15 2019 15:38:04
%S A309164 2,7,31,627,15991
%N A309164 Least k such that the rank of the elliptic curve y^2 = x * (x+1) * (x+k) is n.
%H A309164 H. Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/ec/eca1/cordr.txt">Tables of Elliptic Curves</a>
%o A309164 (PARI) {a(n) = my(k=2); while(ellanalyticrank(ellinit([0, k+1, 0, k, 0]))[1]<>n, k++); k}
%Y A309164 Cf. A309162, A309165.
%K A309164 nonn,more
%O A309164 0,1
%A A309164 _Seiichi Manyama_, Jul 15 2019