Digital root

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Notion

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Science and technology

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What Wikipedia says

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. The process continues until a single-digit number is reached.

Excerpt from the Wikipedia article “Digital root”, under the CC BY-SA 4.0 license. Read the article on Wikipedia