#1**0 **

a Mersenne prime is a prime number one less than a power of two

2^{7} = 128 which means there are 6 number that can be a Mersenne prime less than 100:

2^{1} - 1 = 1, which **isn't **prime

2^{2} - 1 = 3, which is prime

2^{3} - 1 = 7, which is prime

2^{4} - 1 = 15, which **isnt** prime

2^{5} - 1 = 31, which is prime

2^{6} - 1 = 63, which **isnt** prime

this means there are 3 Mersenne primes that are less than 100

Logarhythm Nov 18, 2021