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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 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] The fiftieth Mersenne prime exponent is the first such exponent that starts and ends with the same prime digit. [Loungrides] The sequence of digits '77232917' does not appear in the Mersenne prime 2^77232917  1. [Harrison] The Mersenne prime exponent '77232917' contains a recordbreaking eleven prime substrings when read lefttoright, i.e., 2, 3, 7, 17, 23, 29, 2917, 7723, 23291, 32917, 7232917. [Harrison]
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