A polite number is an integer that sums of at least two consecutive positive integers.
For example 7 = 3+4 so 7 is a polite number.
Given N return N-th polite number.
See also 2595
As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Increment a number, given its digits
Solve the set of simultaneous linear equations
Remove the two elements next to NaN value
Test if two numbers have the same digits
Best Problem Elections
Packing oranges - one layer
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