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READ THESE ARTICLES# Definition of *Mersenne number* in English:

## Mersenne number

### noun

MathematicsA number of the form 2p−1, where n is a prime number. Such a number which is itself prime is also called a Mersenne prime.

*‘Expressed in the form 2 p - 1, where the exponent p is itself prime, Mersenne numbers have characteristics that make it relatively easy to determine whether a candidate is prime.’**‘Written in the form 2 p - 1, where the exponent p is a prime number, Mersenne numbers hold a special place in the never-ending pursuit of larger and larger primes.’**‘One must be the Lucas Lehmer primality test which uses the Fermat congruence, and in particular his application to testing whether a Mersenne number was prime.’**‘And the Great Internet Mersenne Prime Search continues to unearth new Mersenne primes.’**‘Primes of the form are now known as Mersenne primes, and these numbers figure prominently in the search for the largest known prime.’**‘The largest known prime is the 40th Mersenne prime: M 20996011 which has 6320430 decimal digits.’**‘Primes of the form 2 p - 1 are called Mersenne primes.’**‘In 1876 he used his methods to prove that the Mersenne number 2 127-1 is prime.’**‘‘Fermat had this idea that there were families of primes other than Mersenne primes, and there would be an infinite number of them,’ he adds.’**‘Primes of the form 2 n - 1 are known as Mersenne primes, and these numbers figure prominently in the search for the largest known prime.’**‘How can you calculate a perfect number from a Mersenne prime?’**‘The divisor itself is the fifth largest known prime number, and it is the largest that is not a Mersenne prime.’**‘A computer search turned up the 40th Mersenne prime.’**‘Usually you download a screensaver or something, and when your computer isn't busy it turns itself on and cranks away at calculating a Mersenne prime or a SETI signal or some other worthy semi-scientific endeavor.’**‘This project is seeking the largest Mersenne prime number, which is, at the moment, also the largest prime number of any form.’**‘After reading up on how known perfect numbers relate to Mersenne Prime Numbers, I wrote another program, this time to find Mersenne prime numbers and perfect numbers.’**‘A few months later an engineer at Cray Research discovered a new record Mersenne prime number, and I wrote a 700-word piece describing the discovery.’*

**Origin**

Late 19th century named after Marin Mersenne (1588–1648), French mathematician.

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