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.
Right and wrong
Getting the absolute index from a matrix
Basics: 'Find the eigenvalues of given matrix
04 - Scalar Equations 1
07 - Common functions and indexing 3
Arithmetic/geometric sequence, 50/50
Polite numbers. Politeness.
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