The book is now available! 583
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The least integer which is not sum or difference of two integers such that all their prime factors are 2, 3, and 5 [Crespi de Valldaura]

+ 583 is the first integer n such that 47*2^n+1 is prime.

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