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According to Mersenne 2n - 1 is a Prime number(where n is also a prime number).

As we all know the first prime number is 2 so putting the value of 2 in Mersenne's expression we get 22 - 1 = 3. So, 3 is the first Mersenne prime.

Mersenne expression was considered as a method of finding primes. But it didn't always give prime number. Let us consider an example:

Putting n = 11 in the expression we get 211 - 1 = 2047, but 2047 is not a prime number.

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Q: What is first Mersenne prime number?
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