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...
Divisors of an integer
sum of non-primes
calculate linear convolution two vectors
Swap two numbers
remove nans fast
is the number happy?
Convert a Cell Array into an Array
Strange Number Algorithms
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