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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.
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Duplicate: https://www.codewars.com/kata/59b44d00bf10a439dd00006f
Also almost: https://www.codewars.com/kata/5ce399e0047a45001c853c2b
Similar: https://www.codewars.com/kata/58b42c98f4cdd62f45000c6e
But author solution is one of the slowest solutions, which basically makes the author fail the performance requirement ;-)
Unfortunately this is no difference from lots of existing number factorization katas, for instance: