The book is now available! 31723
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ Pope Pius IX officially ended his reign as pontiff after 31 years, 7 months and 23 days. Note that 31, 7, 23, and 31723 are all prime numbers. [Rivera]

+ The concatenation of the indices of two consecutive repunit primes (R317 and R23) is an emirp. [Loungrides]




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