The book is now available! 731
(another Prime Pages' Curiosity)
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731 is composite, being the product of the primes 17 and 43, but 7331, 73331, 733331 and 7333331 are all prime. This is the only three-digit composite with this property.

 

  Submitted: 2004-08-24 02:41:14;   Last Modified: 2008-01-30 11:28:00.



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