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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 think that whoever coded the random tests for Perl made a mistake. I get the following test failures occasionally:
But the expected answer is clearly wrong, as the Nth rightmost digit in the number must always be below N by definition. The last digit can only be 0, the second-last can only be 0 or 1 and so on. And if the factorial-base number has 14 digits, it can't have the digit "E" anywhere, since it represents 14!