The book is now available! 435472
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 435472 = sigma(prime(4)*4! + prime(3)*3! + prime(5)*5! + prime(4)*4! + prime(7)*7! + prime(2)*2!). Note that 435472 is the smallest number with this property. [Firoozbakht]

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