Jisho

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すうじこん 数字根
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Noun
1. digital root​
Wikipedia definition
2. Digital root​The digital root (also repeated digital sum) of a number 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. For example, the digital root of is, because and Digital roots can be calculated with congruences rather than by adding up all the digits, a procedure that can save time in the case of very large numbers.
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