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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.
You need to look out for negative numbers!
Apparently power of 4 means n = 4^x. i couldve save ten minutes if i knew this :)
I think the test numbers too high for a 7 kata. It always take longer than 6 seconds to complete. And my math is not too great to figure complex primality tests without getting frustrated :)