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144 is the smallest three-digit number in which the sum of the unique digits of the number equals the sum of its unique prime divisors (2 x 2 x 2 x 2 x 3 x 3 = 144 and 1 + 4 = 5 = 2 + 3). [Cramer]

 

  Submitted: 2001-04-12 20:10:36;   Last Modified: 2008-01-30 11:28:00.



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