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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.
No idea. I'm not a mathematician. I simply found the pattern. For all I know, it doesn't hold at the 1e10th number. However, the number 9 plays a role in many tricks, facts and formulas in the decimal system.
I'm pretty sure it means you've passed these tests so far but got a timeout before you passed the next one
your code passes that test ("single solution"). Either that's not the problem you're facing, or you should reset the trainer.
Closing