Triangular numbers
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In the video, the word "Triangular number" appears too early, creating a potential spoiler to the solution.

(I'm sounding like a film reviewer lol) - 
					
					
					
					
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@bulba_bulbasaur Suggestions and feedback are always welcome.. even if we can't get to them right away, we don't forget about them, and we intend to follow up on all requests.
