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 """
-An Armstrong number is equal to the sum of the cubes of its digits.
+An Armstrong number is equal to the sum of its own digits each raised
+to the power of the number of digits.
 For example, 370 is an Armstrong number because 3*3*3 + 7*7*7 + 0*0*0 = 370.
 An Armstrong number is often called Narcissistic number.
 """