As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Matrix with different incremental runs
Given area find sides
Solving Quadratic Equations (Version 1)
Which permutation is it?
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Polite numbers. Politeness.
Open coded lock.
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