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Digit Sum and Digital Root
Report every decimal digit-sum iteration, additive persistence and digital-root check.
Unsigned ASCII decimal digit word
digit-root.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
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How to use this tool
- Enter the admitted input using Decimal digit word.
- Use the explicit mode and declared finite options. Only selected operation fields participate.
- Select Calculate digital root and download digit-root.json.
Examples
9875 gives29, then11, then2; additive persistence is3.
Limitations
- 1–10,000 ASCII digits,64 KiB report and30-second processing limit.
- No signs, whitespace, separators, exponent notation, Unicode digits or other bases. Leading zeros do not add a persistence step.
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