Game: find the integers

Bill Allombert on Wed, 06 Nov 2024 20:23:03 +0100

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Game: find the integers

To: pari-users@pari.math.u-bordeaux.fr
Subject: Game: find the integers
From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
Date: Wed, 6 Nov 2024 20:22:56 +0100

Dear PARI lovers,

A new little game!

Find positive integers n such that

2*eulerphi(n) = n+1

I know 8 solutions, but maybe there are more!

Cheers,
Bill.

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