1579

This number is a prime.

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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 05:46:53; Last Modified: 2022-02-16 20:17:15.