Mersenne prime

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A prime of the form 2p−1, where p is a prime. The number of known primes of this form is over 30, and keeps increasing as they are discovered by using computers. In 1995, the largest known was 21257787−1. Each Mersenne prime gives rise to an even perfect number.

http://www.mersenne.org/ Home page of the Great Internet Mersenne Prime Search.

Subjects: Mathematics.

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