257885161
This number is a prime.
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M48 is the largest known Mersenne prime whose base, i.e. 2,
when left-concatenated to its exponent, i.e. 57885161,
forms a prime.  [Harrison]
 Submitted: 2019-04-24 19:19:31;   Last Modified: 2019-04-24 20:04:46.
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