As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Read a column of numbers and interpolate missing data
Check to see if a Sudoku Puzzle is Solved
Derivative of polynomial
Another colon problem
Pancake sorting - minimum flips.
Optimum Egyptian Fractions
Calculate the Damerau-Levenshtein distance between two strings.
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