View Single Post
Old 2019-11-23, 22:25   #5
a1call's Avatar
"Rashid Naimi"
Oct 2015
Remote to Here/There

2×1,087 Posts

The Mersenne part has been known since 1775 as proven in this link first shown to me by sm:
It is of practical use in proving factors of Mersenne numbers with prime exponents prime.
23 is guaranteed to be prime because it divides M11 and 23= 2*11+1

Last fiddled with by a1call on 2019-11-23 at 22:26
a1call is offline   Reply With Quote