Feeds:
Posts
Comments

## 13S Minimum prime divisors

13. [PEN A14 A71]

A14. Let $n>1$ be an integer. Show that $n$ does not divide $2^n-1$.

A71. Determine all integers $n>1$ such that $\frac{2^n +1}{n^2}$ is an integer.
Here is the official solution file: pen13.pdf

You can also discuss the problems: A14 & A71

### One Response

1. very clear thank to the author!