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Apply TodayThis is an offshoot of Cody Problem 5: Triangle Numbers.

Triangle numbers are the sums of successive integers. So 6 is a triangle number because

6 = 1 + 2 + 3

which can be displayed in a triangular shape like so

* * * * * *

Return all triangle numbers below *N*.

120 correct solutions
114 incorrect solutions

Last solution submitted on Dec 24, 2014