The book is now available! 672
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 672^672 plus the 672nd prime is prime. [Firoozbakht]

+ The largest 3-digit number whose sum of reciprocals of divisors is prime. [Loungrides]

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