Divisor 28903

To determine if any number is divisible by 28903, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 7 and 4129 - then it is divisible by 28903.

The following tests must pass:

• Test if a number is divisible by 7
• The "Oscar Harris Test" for Divisibility by 4129

Easy!