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Two is a Mersenne prime because it follows the algorithm 2n - 1 to produce the Prime number 3 (22 - 1 = 4 -1 = 3).

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Mersenne primes can be defined in two equivalent ways:

Numbers of the form 2n - 1 where n is a prime

or where the number 2n - 1 is itself a prime.

The more commonly accepted definition is the second one. Thus n = 2 gives the smallest Mersenne prime, which is 3.

But, since n = 2 gives a result that is prime, it is also sometimes referred to as a Mersenne prime.

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