The book is now available! 4649
(another Prime Pages' Curiosity)
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+ The smallest composite-digit prime whose prime factors of its digits form another prime when they are concatenated left-to-right. [Honaker]

+ The greatest prime factor of any seven-digit repdigit. [La Haye]

+ 4649 is formed from two consecutive semiprimes (46 and 49); each of them formed from semiprime digits. [Silva]

(There are 2 curios for this number that have not yet been approved by an editor.)




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