If n is a natural number, then(6n^2+6n) is always divisible by

If n is a natural number, then(6n^2+6n) is always divisible by?

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 #388