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The smallest two-digit number N = ab such that the sum and absolute difference of its digits along with the concatenations of each in both directions are all prime. E.g., 5 - 2 = 3, 5 + 2 = 7, 37, and 73 are prime. [Heleen]

 

  Submitted: 2000-06-11 21:09:04;   Last Modified: 2008-01-30 11:28:00.



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