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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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Multithreading and other optimization techniques are an overkill for this particular kata. I am not sure what purpose exactly the
prime_numbers
vector has, but the way it's processed atm causes your problems.It looks like you're doing too many repeating calculations. Do you really need a Vec for this?
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If you tell me the language I will double check, but I can assure you that tests do not go beyond signed int, which would be ~2e9, for almost all languages. Test suite is tuned to pass all tests in below 4 seconds with the almost-trivial, most basic solution (but not worse, i.e. not totally naive).
If your solution needs 800ms for a single number then it's too much, because there's 1000 numbers tested.
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