Divisor 17961

To determine if any number is divisible by 17961, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 5987 - then it is divisible by 17961.

The following tests must pass:

• Test if a number is divisible by 3
• The "harmless_iterator Test" for Divisibility by 5987

Easy!