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Single Curio View: (Seek other curios for this number) The smallest twodigit 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: 20000611 21:09:04; Last Modified: 20080130 11:28:00.
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