The book is now available! 3449
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 2^^n-5 = 2^(2^(2^...(2^2)..))-5 is divisible by 3449 for all sufficiently large n. 3449 is the only prime less than a million for which this is true. [Hartley]

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