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Description: Multiplied by the number in the root. Definition: positive integer number multiplied Africa 0 is called the number of digital product. If the product number 1620 is 1* 6* 2 = 12 and 12 number of the product. Definition: positive integer number multiplied repeatedly taken root as the product of the integer numbers, until the final product is a digital number, this number is called a digital product of the positive integers roots. Programming requirements: Statistics and less than 10,000, and its digital product roots were 1 to 9, the number of positive integers.
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three.doc