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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.
If you'd check if num is even than you could iterate with i+=2 instead of i++ and get x2 times faster solution
They are less than 2 (and not prime). A prime is a natural number greater than 1 that has no positive divisors other than 1 and itself.
What about all negative numbers?