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 A356708 #21 Jun 02 2023 01:56:41 %S A356708 3,4,1,3,1,1,2,5,3,3,2,1,1,3,1,3,1,4,1,1,2,2,2,1,3,2,1,3,1,1,1,5,3,2, %T A356708 2,3,3,2,1,3,1,1,1,2,1,2,1,1,3,4,1,1,1,1,1,4,4,1,1,1,1,1,2,3,9,1,1,1, %U A356708 1,3,2,5,1,2,1,1,1,5,1,1,3,1,1,3,1,2,1,3,1,3,3,2,1,1,2,1,1,4,2,3 %N A356708 Number of integral solutions to Mordell's equation y^2 = x^3 + n^3 with y nonnegative. %C A356708 Equivalently, number of different values of x in the integral solutions to the Mordell's equation y^2 = x^3 + n^3. %F A356708 a(n) = (A081119(n^3)+1)/2 = A134108(n^3) = (A356706(n)+1)/2 = A356707(n)+1. %e A356708 a(2) = 4 because the solutions to y^2 = x^3 + 2^3 with y >= 0 are (-2,0), (1,3), (2,4), and (46,312). %o A356708 (SageMath) [(len(EllipticCurve(QQ, [0, n^3]).integral_points(both_signs=True))+1)/2 for n in range(1, 61)] # _Lucas A. Brown_, Sep 04 2022 %Y A356708 Cf. A081119, A134108, A356706, A356707. %Y A356708 Indices of 1, 2, 3, and 4: A356709, A356710, A356711, A356712. %K A356708 nonn,hard %O A356708 1,1 %A A356708 _Jianing Song_, Aug 23 2022 %E A356708 a(21) corrected and a(22)-a(60) by _Lucas A. Brown_, Sep 04 2022 %E A356708 a(61)-a(100) from _Max Alekseyev_, Jun 01 2023