1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Number theory help

  1. Mar 13, 2014 #1
    Conjecture: suppose n is an integer larger than 1 and n is not prime. Then 2^n-1 is not prime.

    Proof attached.

    Could someone please explain to me how they got to xy= 2^(ab)-1. I see the -1 part. Also I think I

    do not understand the concept of 2^((a-1)b) I mean is it some index or some way of showing it is

    finite? I am confused.
     
  2. jcsd
  3. Mar 13, 2014 #2
    The picture of the proof is showing up right?
     
  4. Mar 13, 2014 #3
    I do not see any picture of the proof attached viewing this on the mobile app on my iPad or when I go to web view.
     
  5. Mar 13, 2014 #4

    Mark44

    Staff: Mentor

    There is no attachment.

    Please start a new thread using the homework template, and showing what you have done. I am closing this thread.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Number theory help
  1. Number theory help (Replies: 1)

  2. Number theory help (Replies: 4)

  3. Number Theory Help (Replies: 40)

  4. Number theory help (Replies: 26)

Loading...