Explore relationships

Digit sum

In mathematics, the digit sum of a natural number in a given number base is the sum of all its digits. For example, the digit sum of the decimal number9045{\displaystyle 9045} would be 9+0+4+5=18.{\displaystyle 9+0+4+5=18.}DefinitionLet n{\displaystyle n} be a natural number.

Use + to expand a branch. Click a topic name to open its summary.