The book is now available! 246
(another Prime Pages' Curiosity)
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+ Lowest number (and only one with 3 factors) whose unique prime factorization contains exactly the first 4 digits (246 = 2*3*41). [Hunter]

+ Zhang’s bound has been reduced to 246 (as of April 14, 2014).

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

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