975379domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = smallest k > 0 such that the elliptic curve y^2 = x^3 - k has rank n, or -1 if no such k exists.at n=6A031508a(n) = smallest |k| such that the elliptic curve y^2 = x^3 + k has rank n, or -1 if no such k exists.at n=6A373795Prime numbersat n=76752