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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.
My "solution" delegates to a Fermat primality test with base 2---which passes the test suite. I don't know enough about AKS to say how (or even if) the test suite could distinguish correct solutions from incorrect solutions like mine, but it might be worth exploring.