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3797 is the only four-digit prime, in which: i.The first digit and the last digit are primes. (3,7) ii.The first two-digit number, the second two-digit number and the third two-digit number are primes. (37,79,97) iii.The first and the last three-digit numbers are primes. (379,797) [Sreechakra]


  Submitted: 2002-06-18 05:19:05;   Last Modified: 2008-01-30 11:28:00.

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