The book is now available! 15667
(another Prime Pages' Curiosity)
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15667 = 1 * 5^6 + 6*7 is the smallest prime of integers n such that by inserting between their digits + or - or * or / or nothing (ie concatenate two digits) you recover n back in a nontrivial way. [Post]

 

  Submitted: 2009-02-28 13:59:05;   Last Modified: 2009-02-28 19:06:25.



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