1621

This number is a prime.

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The mouth of a prime volcano. 1621 is a prime that remains prime when preceded and followed by one, two, three, or four 3's:

    1621 
   316213 
  33162133
 3331621333
333316213333

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Submitted: 2009-04-23 05:59:26; Last Modified: 2009-04-23 20:50:33.