Prove that if a is grater than or equal to 2, n is grater than or equal to 2, and (a^n) -1 is prime, then a = 2 and n is a prime.

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- February 12th 2009, 11:16 AMwrighchrPrimes
Prove that if a is grater than or equal to 2, n is grater than or equal to 2, and (a^n) -1 is prime, then a = 2 and n is a prime.

- February 12th 2009, 10:59 PMThePerfectHacker