This number is a prime.

                                                               13 7438691329

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The largest known prime number (emirp) 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 others are 7, 29, and 33550337. [Loungrides]

Submitted: 2003-11-18 00:20:25;   Last Modified: 2021-04-27 00:54:10.
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