The problem description is broken(?) and you have mentioned the code in the test suite (you might want to remove that)
The test suite has had the "solution" code removed. The description was also cleaned up. (If it's not loading, simply reload the page.) I'm not sure how much these fixes help, though...
Back to basics 4 - Search Path
Is it an Armstrong number?
find the maximum element of the matrix
Strange Number Algorithms
Square the input
Create numeric palindromes and their square roots
Magic Concentric Circles
remove nans fast
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