Divisor 3963

To determine if any number is divisible by 3963, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 1321 - then it is divisible by 3963.

The following tests must pass:

• Test if a number is divisible by 3
• The "Oli Test" for Divisibility by 1321

Easy!