Remigiusz Leon Suwalski on Wed, 06 Nov 2024 22:48:29 +0100


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Re: Game: find the integers 

1, 3, 15, 255, 65535, 83623935, 4294967295, 6992962672132095 have this property (and no other number below 10^25) as stated in https://oeis.org/A050474.

Cheers,
Remigiusz

On Thursday, November 7th, 2024 at 05:04, hermann@stamm-wilbrandt.de <hermann@stamm-wilbrandt.de> wrote:

> On 2024-11-06 20:55, American Citizen wrote:
> 
> > Bill
> > 
> > Is this only true for values of n = 2^[1,2,4,8,16,32,64,128,256,512,
> > etc] - 1 ??
> > 
> > Randall
> 
> No:
> 
> ? n=2^64-1;
> ? 2*eulerphi(n)==n+1
> 0
> ?
> 
> 
> Hermann.