Let a,b and n be positive integers with n ≥ 2. Prove that:
gcd((n^a) - 1, (n^b) - 1)= n^(gcd(a,b)) - 1.
Help please!! I have no idea how to do this!
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A starting point might be similar to:
so if n = dk, with d = gcd(n,m)
and the same for m = dq
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