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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]
(There is one curio for this number that has not yet been approved by an editor.)
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