let b, m, n are some natural numbers
b is bigger than 1
m and n are not equal
b^m - 1 and b^n - 1 have the same set of prime divisors
show that
b + 1 = 2^k
(where k is a natural mumber)
please give me some hints how to show that b is odd
and m = 2, n = 1
or
slove the question