The book is now available! 456
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 456 = sigma ( prime(4)^2 + prime(5)^2 + prime(6)^2 ). Note that 456 is the largest number with this property and there is only two numbers with this property. [Firoozbakht]

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