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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.
This is done because there is no need to check for divisors beyond half of the integer. If there are any divisors, they will be found before reaching the halfway point.
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Try another way without huge numbers ;-)