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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.
Your code isn't fast enough, you're using too many cycles for instance, you're checking all even numbers less than or equal
num/2when testing if it's even already tells you it's not a prime number. It's a problem with your code, reduce the number of cycles of your loop.num/2is too big.