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The exponent in the 50th known Mersenne prime is a concatenation of two 4digit primes, 7723 and 2917. These primes have the same prime sum of digits, (19). Note that this is the 2nd case in which the exponent in a Mersenne prime is a concatenation of two primes with the same length. The first such case is the exponent 859433 in the 33rd Mersenne prime. [Loungrides]
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