Digital sum

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There are four common mathematical meanings of the term digital sum:

  1. In some number base, add the digits of a number together. (see digit sum)
  2. In some number base, add the digits of a number together, and discard any carry.
  3. In some number base, add some numbers together discarding any digit-to-digit carry. (see digital sum in base b)
  4. In some number base, repeatedly add the digits of a number together, until it becomes a one-digit number. (see digital root)
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