The book is now available! 1579
(another Prime Pages' Curiosity)
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The mouth of a prime volcano. It is the smallest prime that remains prime when preceded and followed by one, two, three, or four 9's:
     1579 
    915799 
   99157999 
  9991579999
 999915799999
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  Submitted: 2009-04-21 00:46:53;   Last Modified: 2009-04-21 21:07:42.



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