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anonymous

  • 4 years ago

If x is a positive prime integer, can x + (composite number) ever equal a prime number? What about two composites added together, can they ever reach a prime number?

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  1. mathmate
    • 4 years ago
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    Examples: 17 (prime) + 6 (composite) = 23 (prime) 15(composite) + 14(composite) = 29 (prime)

  2. mathmate
    • 4 years ago
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    In fact, difference between two primes (other than 2) is always composite (div. by 2).

  3. anonymous
    • 4 years ago
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    Thank you. Could you help me on my other problem, it is about k^2 -18x +65. I asked it earlier. I'm stuck.

  4. mathmate
    • 4 years ago
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    You're welcome! :) Sorry, I was late for the other question. You already had an excellent response.

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