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A number with n digits such that it is equal to the sum of the nth powers of its digits is called an n-Armstrong number.

For example 1634 is a 4-Armstrong number because

14 + 64 + 34 + 44 = 1 + 1296 + 81 + 256 = 1634.

There are 88 such numbers in base 10.

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Q: What is known as the Armstrong number?
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