The digital root of a natural number in a given radix is the value obtained by repeatedly summing its digits until a single digit remains. For example, in base ten the digital root of 12345 is 6, because 1 plus 2 plus 3 plus 4 plus 5 equals 15, and 1 plus 5 equals 6. In base ten this is equivalent to the remainder on division by 9, which is why the digital root can be used as a divisibility rule. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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1. Digital Root (Wikipedia)
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The digital root (also repeated digital sum) of a natural number in a given radix is the (single digit) value obtained by an iterative process of summing digits, on each iteration using the result from the previous iteration to compute a digit sum.
Wolfram MathWorld: Digital Root
Wolfram MathWorldIn Branch: Number Theory, Subject classificationsQuote, In Branch: Number Theory, Subject classifications
Number Theory Special Numbers
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