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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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Your algorithm for counting the divisors is very inefficient.
I doubt that it is an issue. Try to optimize your code to get the factors or divisors, of the numbers. This is one of the key factors.