prove that n is composite, then 2^(n)-1 is composite.

I need a prove, but I just want to know can I also prove using a counter example.

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- January 27th 2009, 05:06 PMSally_Mathcomposite
prove that n is composite, then 2^(n)-1 is composite.

I need a prove, but I just want to know can I also prove using a counter example. - January 27th 2009, 06:46 PMThePerfectHacker