Narcissistic Number Checker

A Narcissistic Number (or Armstrong Number) is a positive number which is the sum of its own digits, each raised to the power of the number of digits in a given base.

For example, take 153 (3 digits), which is narcissistic: 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153

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