On Sat, 13 Aug 2022 11:08:53 -0700 (PDT)
"
henh...@gmail.com" <
henh...@gmail.com> wrote:
> (no need to "wait a few days, before..." ------ this must've be known for Centuries)
>
>
> Are the following both true ?
>
> A. if p is prime, then so is (2^p - 1)
>
> ---------- for what kind of P does this fail ?
>
>
> B. if (2^p - 1) is prime, then so is p.
>
>