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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.
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Tests expected results are hardcoded. If someone change wiki article then the test case will be broken. I think it will be better to change hardcoded values to results of reference solution.
No Random Tests
Your code is mutating the input list as the error says, not a kata issue.
check for mutations to original list
You've mutated input list (expectation assertion is on value of input list, not output of method): [] should equal [109]
def broken.