#32 Math Minute: Narcissistic Numbers

According to Wikipedia, a narcissistic number is…

In recreational number theory, a narcissistic number (also known as a pluperfect digital invariant (PPDI), an Armstrong number (after Michael F. Armstrong) or a plus perfect number) is a number that is the sum of its own digits each raised to the power of the number of digits.2000px-Confused.svgHUH?!

image source Wikimedia Commonshttps://goo.gl/images/TW1Lt2

Narcissistic Numbers aren’t actually that confusing if you know how to do a couple things.  Here’s how you can spend your Math Minutes so that you can learn more about these peculiar numbers!

  • Watch this video by Numberphile: https://youtu.be/4aMtJ-V26Z4
  • Look at the list of Narcissistic Numbers on Wolfram Alpha:  http://mathworld.wolfram.com/NarcissisticNumber.html
  • Pick a Narcissistic Number to “work out” on paper to prove it works.  See example below.

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