The book is now available! 1621
(another Prime Pages' Curiosity)
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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 00:59:26;   Last Modified: 2009-04-23 15:50:33.



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