[seqfan] Re: 647089

Olivier Gerard olivier.gerard at gmail.com
Thu Nov 27 11:33:42 CET 2014


On Thu, Nov 27, 2014 at 10:45 AM, юрий герасимов <2stepan at rambler.ru> wrote:

>
> Dear SeqFans.
>
> MAGMA calculator can not find the second and subsequent values of
> composites k such that k*(k - 1) divides 2^(k - 1) - 1. Help
>
> 647089, ... What in the ne[t one?
>
> Best regards, JSG
> .
>

I don't think your formula is correct

2^647088 - 1  is not divisible by 647088   so it cannot be divisible by
647089*647088

Olivier


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