As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Remove any row in which a NaN appears
Is my wife right? Now with even more wrong husband
intersection of matrices
Side of an equilateral triangle
Alternative Scoring. Create an incremental spiral.
Pancake sorting - minimum flips.
Don't Try, give up and return NaN.
Which permutation is it?
Another colon problem
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