Hello. I've got a following problem:

Prove that sqrt((2^{ab}-1)/(2^a -1)) [where a,b, 2^a -1 and 2^b -1 are different prime numbers >2] can't be an integer number.

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- Nov 21st 2010, 07:23 AMolaolaolaSquare root
Hello. I've got a following problem:

Prove that sqrt((2^{ab}-1)/(2^a -1)) [where a,b, 2^a -1 and 2^b -1 are different prime numbers >2] can't be an integer number.