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Math Help - Prove that it is composite number

  1. #1
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    Prove that it is composite number

    I'm trying to solve some problem, but I don't have any good idea to do it
    Prove that a2+b3+c6, where a,b,c are positive integers, is always composite number. Thanks for all help
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  2. #2
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    Re: Prove that it is composite number

    Quote Originally Posted by aleschio View Post
    Prove that a2+b3+c6, where a,b,c are positive integers, is always composite number. Thanks for all help

    But it is not true: let a=2,~b=2,~\&~c=1.
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  3. #3
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    Re: Prove that it is composite number

    And what if a,b and c is different from 1?
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