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...
Who knows the last digit of pi?
Vectorize the digits of an Integer
Add two numbers
Strange Number Algorithms
is the number happy?
Magic Concentric Circles
provide the numerical answer to these number questions...
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