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Why 30 is the largest integer such that none of its ?

  1. Dec 30, 2008 #1
    Why 30 is the largest integer such that none of its....?

    Why 30 is the largest integer such that none of its totatives are composite?
    which means All the coprime numbers that below 30 are primes..
    30=> 7,11,13,17,19,23,29
    ??????//
    and if you have a proof that it is the biggest integer please Help me...
     
  2. jcsd
  3. Dec 30, 2008 #2

    tiny-tim

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    Welcome to PF!

    Hi HussamLawen! Welcome to PF! :smile:

    Hint: 30 = 2.3.5 …

    60 doesn't work because … ? :wink:
     
  4. Dec 30, 2008 #3

    CRGreathouse

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    Re: Welcome to PF!

    And 210 doesn't work because... ?
     
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