Results 1 to 3 of 3

Math Help - proving congruences

  1. #1
    Newbie
    Joined
    Feb 2010
    Posts
    21

    proving congruences

    I am having trouble with proving this particular congruence.

    n^21 is congruent to n(mod 30)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor Drexel28's Avatar
    Joined
    Nov 2009
    From
    Berkeley, California
    Posts
    4,563
    Thanks
    21
    Quote Originally Posted by meshel88 View Post
    I am having trouble with proving this particular congruence.

    n^21 is congruent to n(mod 30)
    What have you tried?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Feb 2010
    Posts
    21
    I know that I have to prove that 2,3,5 divide n^21-n but that is where I get stuck.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. proving an equation using congruences
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: March 1st 2010, 02:37 PM
  2. Congruences
    Posted in the Discrete Math Forum
    Replies: 1
    Last Post: October 6th 2008, 06:18 PM
  3. Congruences
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: September 29th 2008, 09:49 AM
  4. congruences 2
    Posted in the Number Theory Forum
    Replies: 5
    Last Post: September 21st 2008, 09:46 PM
  5. congruences
    Posted in the Number Theory Forum
    Replies: 13
    Last Post: March 30th 2008, 10:11 AM

Search Tags


/mathhelpforum @mathhelpforum