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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.
Default tests weren't good enough. Maybe add a reversed list and a couple of other cases.
Yup. The test would be better if the content would be random. Now it's too easy to misunderstand the problem definition.
Note that multiples of 3 & 5 may overlap with each other. I hope this helps. :)