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Digit Sum | Digit Sum below Value | Base-k Digit Sum | Weighted Digit Sum | Digit Product | Triangular Number

Calculate Digit Sum below a Given Value

Calculator for the digit sum until a value is reached or underrun. The iterated digit sum (executed several times in a row) is calculated up to a final value. The maximum final value must be greater than 8, if it is 9, it is the normal iterated checksum.

Maximum final value:





Digit sum to :


Example: with a maximum final value of 20 and the sequence of numbers 4547457474567, the digit sum is 15.




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