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 sum of the elements in the "second" diagonal
Longest run of consecutive numbers
Check if number exists in vector
07 - Common functions and indexing 5
Alternative Scoring. Create an incremental spiral.
Which permutation is it?
Best Problem Elections
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