Yes, but I am left hanging on the specific details. He factors to yield (x + y)(x^2 - xy + x^2) = 42 - z^3 He brute force searches over values d and finds

Yes, but I am left hanging on the specific details. He factors to yield (x + y)(x^2 - xy + x^2) = 42 - z^3 He brute force searches over values d and finds a value z such that d divides 42 - z^3 (evidently these are rare and easy to find) and then solves the following two equations for x and y (which is easy): d = x + y x^2 - xy + x^2 = (42 - z^3)/d The part I don't get is how to find the z's given d. Does anyone know where to find these details?