The book is now available! 597
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 597 is a semiprime (having exactly 2 prime factors). 597 to 611 is the largest gap between 2 semi-primes less than 1000. [Colucci]

(There is one curio for this number that has not yet been approved by an editor.)

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