The book is now available! 3407
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ (3407, 7043) is the only pair of 4-digit distinct-digit emirps whose one digit is equal to the sum of the other digits. [Loungrides]

+ An emirp whose sum of two leftmost digits is equal to the sum of its two rightmost digits. [Forouhari]

(There is one curio for this number that has not yet been approved by an editor.)

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