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Old 2021-02-23, 14:32   #7
bhelmes's Avatar
Mar 2016

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A peaceful and pleasant day in spite of Covid-19

Originally Posted by JeppeSN 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

I was a little bit astonished about it. I have no explication for it.

Perhaps someone could explain it to me and other members, interested in number theory.

@Batalov: The factoring for Mp+1 is easy, sufficient for a proof and very nice, but perhaps the factoring of Mp-1 gives some more details.
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