# Yet another curious identity?

**Geometry**Level 5

Find the smallest integer \(n>3\) such that \(\displaystyle \prod_{k=3}^{n}2\cos(2^k)=1\), where angles are measured in degrees.

If no such \(n\) exists, enter 666 as your answer.

**Bonus question**: What is the solution for \(\displaystyle \prod_{k=2}^{n}2\cos(2^k)=1\)?