The book is now available! 899
(another Prime Pages' Curiosity)
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Participate:
+ Any number consisting of an 8 followed by an even number of 9's has prime factors (3*10^(n/2)+1 and (3*10^(n/2)-1, where n is the number of 9's. Thus 899 = 29*31 and 8999999 = 2999*3001.

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