Provenance: Noam D. Elkies, "j = 0, rank 15; also 3-rank 6 and 7 in real and imaginary quadratic fields", NMBRTHRY posting, December 30, 2009. This is the Mordell curve y^2 = x^3 + 46974552981863676115647417. The submitted witnesses consist of integral points on this curve plus two points obtained from integral points on the 3-isogenous curve y^2 = x^3 - 27K via the dual 3-isogeny.
David Renshaw · 2026-05-29 11:30:59