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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.
Around 2100 ms with Python 3.
I got 2258ms with PHP.
I'd recommend having a look at primality tests. My favourite is 6k±1 because of its simplicity.
Time: 2707ms on Python 3