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Digital root/Multiplicative digital root: Difference between revisions
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* [http://mathworld.wolfram.com/MultiplicativeDigitalRoot.html Multiplicative Digital Root] on Wolfram Mathworld.
* [http://oeis.org/A031347 Multiplicative digital root] on The On-Line Encyclopedia of Integer Sequences.
* [https://www.youtube.com/watch?v=Wim9WJeDTHQ What's special about 277777788888899?] - Numberphile video
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