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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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If you propose a kata, you are supposed to come with a decent solution, not me or someone else.You should ensure to generate solvable inputs, and give clues in the description for micro-optimization or something, because there is no unfallible algorithm to factorize quickly very big numbers. DON'T CLOSE ISSUES IF THEY ARE NOT SOLVED.