The book is now available! 874
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The repunit number R874 consisting of 874 1's is the smallest repunit number that has, between other factors, the repunit primes with 2, 19 and 23 1's. [Loungrides]

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