The book is now available! 29177723
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ A 3-sphenic number, i.e., 29177723 = 107 × 389 × 701, with emirp prime factors, that is the concatenation in order of the 4-digit primes 2917, 7723 whose the concatenation in reverse order, i.e., 77232917, becomes the exponent in the 50th Mersenne prime. [Loungrides]

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