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Old 2021-02-23, 23:35   #9
Viliam Furik
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"Viliam Furík"
Jul 2018
Martin, Slovakia

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Originally Posted by bhelmes View Post
I noticed that the factors of Mp-1 have the following proporty:
r odd and r | p-1 then the factors f of Mp-1 with f > p are f=1 mod r
Not quite. M1277-1 has a factor of 2089, among others. 1277-1 is divisible by 11. 2089 is 10 (mod 11), not 1.
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