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I Can I get Help with Number Theory?

  1. Feb 2, 2017 #1
    I need help to prove the following: Let n be a natural number such that n is odd; prove that the integer a is a Fermat witness for n if and only if n-a is a Fermat witness for n.

    If need be, I can explain what a Fermat witness is.
  2. jcsd
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