When measuring performance, it is best to use huge numbers (N = randi(1701034) may return a small number, and it would be best that you use something like 1e7 + randi(1e5)). If N is small (and currently it can be), the trivial sum may perform better depending on which operations are running at the server in a given moment.
Determine if a Given Number is a Triangle Number
Back to basics 4 - Search Path
Angle between Two Vectors
Log of a number
Find the diagonal of the square of side L
Geometrical meaning of determinant
Simple polynomial evaluation
Non trivial identities - reshape
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