As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Back to basics 17 - white space
We love vectorized solutions. Problem 1 : remove the row average.
Equal to their cube
What number has this problem?
Sum of odd numbers in a matrix
How many solutions has this problem?
Don't Try, give up and return NaN.
expand intervals vol.2
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