[math-fun] What is the name of [mod 9 digitsum]
Hello Math-Fun, is there a name for this operation : - start with 178 for instance; - add the digits: 1+7+8 => 16 - add the digits again: 1+6 => 7 Does the operation going from 178 to 7 have a name (other than "modulus 9 digitsum")? Thank you, Best, É.
I've seen it referred to as a "digital root" http://en.wikipedia.org/wiki/Digital_root Dave On Thu, Feb 25, 2010 at 9:29 AM, Eric Angelini <Eric.Angelini@kntv.be> wrote:
Hello Math-Fun, is there a name for this operation :
- start with 178 for instance; - add the digits: 1+7+8 => 16 - add the digits again: 1+6 => 7
Does the operation going from 178 to 7 have a name (other than "modulus 9 digitsum")?
Thank you, Best, É.
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Dave Blackston -
Eric Angelini