Look at this series: 42, 36, 39, __, 42, 45, 42, 48…

Look at this series: 42, 36, 39, __, 42, 45, 42, 48, ... What number should fill the blank?

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 #90404