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The larger of only two 3-digit primes that remain prime when inserting one, two or three zeros between each digit, i.e., 50707, 5007007, 500070007 are primes. The other such prime is 131. [Loungrides]

 

  Submitted: 2011-08-21 10:36:58;   Last Modified: 2011-08-21 11:26:03.



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