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Problem 291. Triangle Numbers Below N

Created by @bmtran

This 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.


Problem Group

Solution Statistics

138 correct solutions 128 incorrect solutions
Last solution submitted on Feb 01, 2016