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divisibility by three
'''Recursion''' is the repeated application of a procedure or definition through reference to itself.
'''Recursion''' is the repeated application of a procedure or definition through reference to itself.
===In Mathematics===
There's a simple procedure for finding out whether a number is divisible by three.
#If the number is 3, 6, or 9 then it's divisible by three.
#Otherwise, add all the digits of the number; if the sum of the digits is divisible by three, then so is the original number.
Examples:
* 12 => 1 + 2 = 3 (yes)
* 14 => 1 + 4 = 5 (no)
* 96 => 9 + 6 = 15; 15 => 1 + 5 = 6
===In Computing===
===In Computing===