If x and y are prime numbers such that x > y…

If x and y are prime numbers such that x > y > 4, then x^2 − y^2 must be divisible by which one of the following numbers?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #14207