Prime numbers have long fascinated amateur and professional mathematicians. An integer greater than one is calleda prime number if its only divisorsare one and itself. The first primenumbers are 2, 3, 5, 7, 11, etc. For example, the number 10 is not prime because it is divisible by2 and 5. A Mersenne prime is a prime of the form 2P-1. The first Mersenne primes are 3, 7, 31, 127 (corresponding to P = 2, 3, 5,7). There are only 44 known Mersenne primes.
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