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(3217, 7213) is the only pair of primes formed from a double-digit number n, (n=37), by inserting the product of its digits in between the digits of the number n and in between the digits of the reversal of n. [Loungrides]

 

  Submitted: 2011-07-02 05:20:47;   Last Modified: 2011-10-17 06:47:46.



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