A sum-product number in a given number base b {\displaystyle b} is a natural number that is equal to the product of the sum of its digits and the product of its digits. There are a finite number of sum-product numbers in any given base b {\displaystyle b} .
A sum-product number in a given number base b {\displaystyle b} is a natural number that is equal to the product of the sum of its digits and the product of its digits. There are a finite number of sum-product numbers in any given base b {\displaystyle b} .
Source: Wikipedia "Sum-product number" · CC BY-SA 4.0
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