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818 is the only 3-digit tetradic integer such that the sum of the differences of the number and each digit raised to the digit is prime. I.e., (818-8)^8+(818-1)^1+(818-8)^8 is prime. [Opao]

 

  Submitted: 2003-12-08 20:50:49;   Last Modified: 2008-01-30 11:28:00.



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