Divisor 26401

To determine if any number is divisible by 26401, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 17 and 1553 - then it is divisible by 26401.

The following tests must pass:

• Test if a number is divisible by 17
• The "Niklas Test" for Divisibility by 1553

Easy!