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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 just have to know about substraction ;)
I think the solution is a lot simpler than most people think, I solved it and I have no clue what the triangular number sequence is.
Why? What does the kyu have to do with it? Anyway, my ignorance of any known sequence didn't prevent me from solving the kata.
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