Daily Math Challenge

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Problem 1219

Posted: October 1, 2024

94 % of users got this correct

Some positive integers have the property that they are equal to the product of their digits plus the sum of their digits.  For example, 79 =7*9 + 7 + 9.  Find the number of 2-digit positive integers with this property.

Problem submitted by Pat Costello, Eastern Kentucky University

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