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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.
I edited the description, as well. I hope, this is now more comprehensible.
I think it was rather clear, also given the example right down below, but not being a native speaker, I could not say for sure; I just edited the description a bit to make it less ambigous: let me know how do you read it now :)
I think, you misunderstand the description.
The position in the number is relevant. First digit (= odd digit) is 4, second digit (= even digit) is 0, and so on. It's an alternate multiplication with 1 and 3.
it's multiplied based on the position of the number and not whether the number is odd or even.
Is this solved yet? Just curious :)
This comment is hidden because it contains spoiler information about the solution
Care to post your code (using the spoiler flag, of course), so that I can verify it?
I am running a few tests with the Ruby version, but it seems to work fine.