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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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I haven't yet given up on this kata, but I would like to know:
Is there an actual, general solution for this problem, or should I cobble together something from OEIS series, rules about primes and powers of them, and educated guesses that are not provably correct?
To see the tests, I submitted with
return []
.All the random tests passed. Is that supposed to happen?