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Math Help - Euler's phi function

  1. #1
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    Euler's phi function

    Find (19n) in terms of (n) if n has no factors of 19.
    * is Euler's phi function
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  2. #2
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    If gcd(a,b)=1 then \phi(ab)= \phi(a) \phi(b)

    Does this help?
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  3. #3
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    i think so. so the answer would be 18(n)?
    thank you
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