An "Armstrong number" is an n-digit number that is equal to the sum of the nth powers of its individual digits. For example, 153 is an Armstrong number because it has 3 digits and 13+53+33=153. What is the digit k in the Armstrong number 1,6k4?
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1 首先排除k=1时的值,不等。 2 k大于1是为4位数, 16k4= 1604+k10,
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