375376domain: NAppears in sequencesSuccessive values x such that the Mordell elliptic curve x^3 - y^2 = d has extremal points with quadratic extension over the rationals.at n=16A200656Secondary terms in A200656.at n=2A201048G.f. (4*x+3)/(2*(x+1))*(1+1/sqrt(-4*x^4-4*x^3+1)).at n=25A247169