Find the invalid no.from the following series 3, 7, 15, 27, 63…

Find the invalid no.from the following series 3, 7, 15, 27, 63, 127, 255

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

~8 minAnswer checked instantly

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #2165

Stuck? A gentle nudge

No hints for this one.

Something off?

Workspace

Your answer

Checked against the answer in AQuA-RAT.