Test whether a number is an Armstrong number and list every one up to a limit.
In number theory, an Armstrong number (also called a narcissistic number) is one that
equals the sum of each of its own digits raised to the power of the number of digits.
Example: 153 has 3 digits, so 1³ + 5³ + 3³ = 1 + 125 + 27 = 153, and 153 is an Armstrong number.
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