As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Remove NaN ?
Back to basics 15 - Benchmark
Back to basics 26 - Keywords
select the primes of a vector
Solving Quadratic Equations (Version 1)
Which permutation is it?
Pancakes for everyone!
Open coded lock.
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