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anonymous

  • 5 years ago

Thanks guys - Find the greatest prime factor of 2^20-1 (I got 41, could someone tell me if that is correct and how they obtained their solution?)

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  1. amistre64
    • 5 years ago
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    2^(20-1)?

  2. anonymous
    • 5 years ago
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    (2^20)-2

  3. anonymous
    • 5 years ago
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    Whoops, (2^20)-1

  4. anonymous
    • 5 years ago
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    so you are try to find the largest prime p such that \[2^{20}\equiv 1(mod p)\]

  5. anonymous
    • 5 years ago
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    Yes. I totally forgot how to use modulus, but yes, I believe that is it.

  6. anonymous
    • 5 years ago
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    yeah my number theory is a bit rusty, I would need to look up some theorems as well...

  7. anonymous
    • 5 years ago
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    Oh darn. =] Anyone care to help?

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