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References to 'digital root'
1. digit sum by PrimeFan
2. divisibility test by CompositeFan
3. duodecimal by PrimeFan
4. examples of digital roots in a few selected bases by PrimeFan
5. Harshad number by PrimeFan
6. hexadecimal by PrimeFan
7. hexagonal number by PrimeFan
8. numerology by CompositeFan
9. temporary index 3 of number theory topics by PrimeFan