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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Trivial/exact duplicate :
Factors, as you have them, are properly called divisors.
Also,
0 < null <= 1000000is not applicable, so your note is incomplete and simply not true. Does it really add anything to test withnullinput? (But not with negative, undefined, string, rodent, boolean or infinite input?)