For which positive integer values of N is 2^N-1 a multiple of N?

As far as whether it is 2^(N-1) or (2^N) - 1:

since there are no parentheses, I would assume that the usual order of operations applies.  Since exponentiation is 'stronger' than subtraction, then I assume it to be: (2^N) - 1

Posted by Larry on 2004-12-12 08:20:22