Sum-Product Number
A sum-product number is a number 
such that the sum of 's digits times the product of 's digit is itself, for example
The only sum-product numbers less than
are 1, 135, and 144.See also Amenable Number
| 单词 | Sum-Product Number |
| 释义 | Sum-Product NumberA sum-product number is a number The only sum-product numbers less than are 1, 135, and 144.See also Amenable Number |
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