Ars Technica writes that among the numbers between 0 and 225,964,951-1, there are 1,622,441 prime numbers. Within that same range, there are only 42 Mersenne primes. That’s how rare a Mersenne ...

A prime number is a positive number divisible by only itself and 1 - 2, 3, 5, 7 and so on. The number that the team found is 9.1 million digits long. It is a Mersenne prime known as M30402457 ...