A problem must detail what needs to be done in its description. There is not only one way to do what's requested. You should probably add more test cases too, at least 5, to avoid lookup table solutions.
Triangle Numbers Below N
Generate a vector like 1,2,2,3,3,3,4,4,4,4
07 - Common functions and indexing 1
Area of Ellipse
matrix rows and columns
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