Divisor 17717

To determine if any number is divisible by 17717, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 7 and 2531 - then it is divisible by 17717.

The following tests must pass:

• Test if a number is divisible by 7
• The "Justin Newnum Test" for Divisibility by 2531

Easy!