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Math Help - Homework

  1. #1
    Newbie Sidereus Nuncius's Avatar
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    Homework

    Can you help me with this problem?

    I'm a little confused...

    "If p is a prime number, prove that the number 27p + 1 is a prime one"
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Sidereus Nuncius View Post
    Can you help me with this problem?

    I'm a little confused...

    "If p is a prime number, prove that the number 27p + 1 is a prime one"
    This is not true. If p = 3 then 27p + 1 is an even number greater than 2, which is not prime.

    -Dan
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by topsquark View Post
    This is not true. If p = 3 then 27p + 1 is an even number greater than 2, which is not prime.

    -Dan
    Worse than that; if p is any prime greater than 2, then 27p+1 is even and so not prime.

    RonL
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  4. #4
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    Off Topic: I am very proud of myself, I realized that your Username means "Starry Messanger" which was published by Galileo.
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  5. #5
    Grand Panjandrum
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    Quote Originally Posted by ThePerfectHacker View Post
    Off Topic: I am very proud of myself, I realized that your Username means "Starry Messanger" which was published by Galileo.
    Some here did not need to realise it, but knew it

    RonL
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  6. #6
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    Quote Originally Posted by CaptainBlank View Post
    Some here did not need to realise it, but knew it

    RonL
    This was the first time since many many years ago when I first learned it I seen it used again. Thus, I assumed this is not common knowledge.
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  7. #7
    Forum Admin topsquark's Avatar
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    Hmmmm....

    I would've guessed a spell from "Harry Potter."

    -Dan
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