IMO Preparation Mock 1 Problem 3
Posted: Mon Apr 15, 2013 7:59 pm
Find all positive integers $m,n \geq 2$,such that,
$1$. $m+1$ is a prime number of the form $4k-1$
$2$.there is a prime number $p$ and non-negative integer $a$,such that
\[\frac{m^{2^{n}-1}-1}{m-1}=m^{n}+p^{a}\]
$1$. $m+1$ is a prime number of the form $4k-1$
$2$.there is a prime number $p$ and non-negative integer $a$,such that
\[\frac{m^{2^{n}-1}-1}{m-1}=m^{n}+p^{a}\]