show that if a and n are positive integers with n>1, a>1 such that (a^n)+1 is prime, then n=2^k, where k is a positive integer.
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Originally Posted by mandy123 show that if a and n are positive integers with n>1, a>1 such that (a^n)+1 is prime, then n=2^k, where k is a positive integer. If is odd then . Thus, if has a non-trivial odd factor then and it would not be prime.
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