Results 1 to 2 of 2

Math Help - Another not integer number

  1. #1
    Super Member dhiab's Avatar
    Joined
    May 2009
    From
    ALGERIA
    Posts
    534

    Another not integer number

    n is a integer number .
    Prove that number is not
    integer number .
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor undefined's Avatar
    Joined
    Mar 2010
    From
    Chicago
    Posts
    2,340
    Awards
    1
    Quote Originally Posted by dhiab View Post
    n is a integer number .
    Prove that number is not
    integer number .
    A perfect cube must be congruent to 0, 1, or 8 (mod 9).

    Here is a table of n and its corresponding 3n^2+3n+7 (mod 9).

    0, 7
    1, 4
    2, 7
    3, 7
    4, 4
    5, 7
    6, 7
    7, 4
    8, 7

    This list is exhaustive, and constitutes a proof.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. not integer number
    Posted in the Number Theory Forum
    Replies: 10
    Last Post: May 24th 2010, 05:06 PM
  2. the largest integer number
    Posted in the Number Theory Forum
    Replies: 3
    Last Post: February 22nd 2010, 09:14 AM
  3. the largest integer number
    Posted in the Number Theory Forum
    Replies: 0
    Last Post: February 15th 2010, 11:20 AM
  4. Replies: 4
    Last Post: February 2nd 2010, 04:09 PM
  5. show the number is not integer
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: February 26th 2008, 12:27 PM

Search Tags


/mathhelpforum @mathhelpforum