The book is now available! 99499
(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 palindrome composite-digit 2-sphenic number, i.e., 99499 = 29 * 47 * 73. Note that the concatenation in order and reverse order of its prime factors, i.e., 294773 and 734729 are both primes. [Loungrides]

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