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Thread: New/Interesting

  1. #1
    Aug 2017
    Coquitlam, bc


    I'm new to this forum but I really like math and study it pretty much every day. I came across something about primes that's interesting:
    Elementary prime test: If no prime is less then or equal to sqrt(m), divides m, then m is a prime.
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  2. #2
    MHF Contributor

    Apr 2005

    Re: New/Interesting

    Yes, that is true and it is interesting. It is true, of course, because if n is a composite number with factors a and b, n= ab, one of the factors must be less than or equal to sqrt(n) and the other larger or equal.
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