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.

Printable View

- Jan 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. - Jan 27th 2009, 06:46 PMThePerfectHacker