2 n 1 is prime July 8, 2019 16 32 64 128 If 2 n 1 is prime 2 n 1 primes 2 n 1 prime number 2 n 1 prime then n is prime If n is prime then 2 n 1 is prime 2 n 1 is not prime Is 2 n 1 always prime For every positive integer n 2 n 1 is prime 2 n 1 is prime then n is a power of 2
