:confused: What is:

A number n where if the sum of digits of the number is divisible by n, then the number it self is divisible by n.

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- April 6th 2006, 07:07 PMaakkmmHelp!Question:confused:
:confused: What is:

A number n where if the sum of digits of the number is divisible by n, then the number it self is divisible by n. - April 7th 2006, 06:21 AMtopsquarkQuote:

Originally Posted by**aakkmm**

-Dan - April 29th 2006, 01:15 AMrgep
You're being asked to test the validity of rules like 'if the sum of the digits of a number is divisible by 2 then that number is divisible by 2' (which isn't true: consider 11) or 'if the sum of the digits of a number is divisible by 3 then that number is divisible by 3' (which is true: can you see why?). So 3 is an answer to your question: there are others ...