As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Roll the Dice!
Return elements unique to either input
middleAsColumn: Return all but first and last element as a column vector
Sum the numbers on the main diagonal
Beginner's Problem - Squaring
expand intervals vol.2
Best Problem Elections
Alternative Scoring. Create an incremental spiral.
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