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 A228532 #14 Aug 24 2022 23:12:27 %S A228532 6,0,0,3,0,0,0,2,3,0,0,0,0,0,0,3,0,0,0,0,0,0,0,0,3,0,2,0,0,0,0,0,0,0, %T A228532 0,3,0,0,0,0,0,0,0,0,0,0,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0, %U A228532 0,0,0,0,0,0,0,0,0,0,0,0,3,0,0,0,0,0,0 %N A228532 a(n) = order of the torsion subgroup of the elliptic curve y^2 = x^3 + n if n is a sixth-power-free integer, otherwise -1. %D A228532 Dale Husemoller, Elliptic Curves, Graduate Texts in Mathematics 111, Springer-Verlag, 2004, pp. 35-37. %H A228532 J. Gebel, <a href="/A001014/a001014.txt">Integer points on Mordell curves</a> [Cached copy, after the original web site tnt.math.se.tmu.ac.jp was shut down in 2017] %H A228532 Wikipedia, <a href="http://en.wikipedia.org/wiki/Torsion_subgroup">Torsion subgroup</a> %F A228532 a(A062838(n)) = 2 for n > 1. %F A228532 a(A179126(n)) = 3. %Y A228532 Cf. A000290, A062838, A179126. %K A228532 easy,sign %O A228532 1,1 %A A228532 _Arkadiusz Wesolowski_, Aug 24 2013