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December 30th, 2008, 03:44 AM   #1
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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...
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December 30th, 2008, 07:45 AM   #2
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Re: Why 30 is the largest integer such that none of its....?

I responded at physicsforums already. Look at the factorization of 30 and compare to the Sieve of Eratosthenes.
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