The book is now available! 7597
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The only 4-digit semi-prime with prime factors emirps, 7597 = 71 * 107, whose the reversal, i.e., 7957, is also a semi-prime with prime factors the twins of the previous prime factors, i.e., 7957 = 73 *109. [Loungrides]

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