This number is a prime.

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The third known prime number of the form 2^(p-1)*(2^p-1)+1, where 2^p-1 is a Mersenne prime. Such numbers are called right perfect primes. The first and second ones are 7 and 29. [Rivera]

Submitted: 2016-12-10 08:44:12;   Last Modified: 2020-05-03 11:28:12.
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