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Old 2020-10-14, 15:02   #9
Nick
 
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Dec 2012
The Netherlands

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Quote:
Originally Posted by henryzz View Post
For 2^n+1 to be prime n must be a power of 2 https://mathworld.wolfram.com/FermatNumber.html has a proof of this.
So do we!: proposition 16 here
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