As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Back to basics 26 - Keywords
Find the largest value in the 3D matrix
Output any real number that is neither positive nor negative
Make a vector of prime numbers
Pernicious Anniversary Problem
Don't Try, give up and return NaN.
Packing oranges - one layer
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