Integer expressible as the sum of its own digits each raised to the power of the number of digits
For other uses, see Narcissism (disambiguation).
In number theory, a narcissistic number[1][2] (also known as a pluperfect digital invariant (PPDI),[3] an Armstrong number[4] (after Michael F. Armstrong)[5] or a plus perfect number)[6] in a given number base is a number that is the sum of its own digits each raised to the power of the number of digits.
^Weisstein, Eric W. "Narcissistic Number". MathWorld.
^Perfect and PluPerfect Digital Invariants Archived 2007-10-10 at the Wayback Machine by Scott Moore
^PPDI (Armstrong) Numbers by Harvey Heinz
^Armstrong Numbers by Dik T. Winter
^Lionel Deimel’s Web Log
^(sequence A005188 in the OEIS)
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