# Integral points on elliptic curves of the form $y^2=x^3+px$

As the title says. Can we determine all the integral points on elliptic curves of the form

$$y^2=x^3+px$$

for a prime $p$? If yes, can someone explain me how? A good reference would also be sufficient.

## 1 Answer

This is completely worked out in Walsh's paper:

In particular, for your elliptic curve $y^2=x^3+px$, there are at most 2 primitive integer solutions if $p>3$, and 4 if $p=3$.

As for imprimitive solutions in this case ($k=1$, $d=p$), the proof of theorem 4 indicates that such a solution would be a counterexample to the Ankeny-Artin-Chowla conjecture.

• Thanks a lot. But it seems that there is no explanation how to determine the imprimitive solutions of $k=1$. In section $7$ on page 1299 he explain how to compute imprimitive solutions only for $k>3$. Does that mean that there are no imprimitive solutions for $k\leq 3$? – Benjamin Oct 31 '15 at 14:06
• @Marc Look at the last paragraph of page 1297 and the first one of 1298. I think the conclusion is that there is no solution if and only if the Ankeny-Artin-Chowla conjecture is true, so it is an open problem (but most likely true). – Myshkin Oct 31 '15 at 14:12