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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.
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Negative numbers definitely aren't prime, but for the purposes of this kata they are. I agree, it's a bit questionable, but I suppose it helps to make it trickier.. if only slightly.
Thanks. It is one of the classical katas, so I try to find new ways to solve it.
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Thanks! The name of test is changed.