mersenneforum.org - View Single Post - for which values of p this expression has the form s*2^k?

wblipp · 2019-04-11, 01:14

Quote:

Originally Posted by enzocreti

let be p an arbitrary prime...
can you find values of p such that

(10^p-1)/9+1 has the form s*2^k?

2, 3, 7, 229, 1579