Re: Game: find the integers

American Citizen on Wed, 06 Nov 2024 20:55:41 +0100

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Re: Game: find the integers

To: pari-users@pari.math.u-bordeaux.fr
Subject: Re: Game: find the integers
From: American Citizen <website.reader3@gmail.com>
Date: Wed, 6 Nov 2024 11:55:34 -0800
Delivery-date: Wed, 06 Nov 2024 20:55:41 +0100
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Bill

Is this only true for values of n = 2^[1,2,4,8,16,32,64,128,256,512,etc] - 1 ??


Randall

On 11/6/24 11:22, Bill Allombert wrote:

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.

Follow-Ups:
- Re: Game: find the integers
  - From: hermann@stamm-wilbrandt.de

References:
- Game: find the integers
  - From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>

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