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.
Find the numeric mean of the prime numbers in a matrix.
Back to basics 23 - Triangular matrix
sum of first 'n' terms
Fibonacci-Sum of Squares
Don't Try, give up and return NaN.
Packing oranges - one layer
Modify subscripts - easier
Pernicious Anniversary Problem
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