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Perfect Numbers

  1. Dec 3, 2009 #1
    Show that ----> if n is even perfect number than n [tex]\equiv[/tex]6(mod10) or n[tex]\equiv[/tex]8(mod10)
     
  2. jcsd
  3. Dec 3, 2009 #2

    CRGreathouse

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    Do you know the Euclid-Euler form?
     
  4. Dec 3, 2009 #3
    2^(p-1) *(2^p-1) formula i think you have said, i know this formula but i haven't get the result with this.
     
    Last edited: Dec 4, 2009
  5. Dec 4, 2009 #4
    I can't believe to myself i think i proved :)
    http://www.loadtr.com/465992-mmmmm.htm [Broken]
     
    Last edited by a moderator: May 4, 2017
  6. Dec 6, 2009 #5
    yea. it should be it
     
    Last edited by a moderator: May 4, 2017
  7. Dec 10, 2009 #6
    it is important point of exponential of 4 is congruence 4 or 6 mod 10, i have missed it i think :)
     
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