The book is now available! 25011
(another Prime Pages' Curiosity)
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Mark Kozek and Michael Filaseta discovered that 25011 is the smallest composite number which is never a prime if you insert any digit into its decimal expansion. [Post]

 

  Submitted: 2007-02-02 12:36:33;   Last Modified: 2008-01-30 11:28:00.



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