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.
Sums with Excluded Digits
Add a row of zeros on top of a matrix
multiply by three
Reverse a string
Non trivial identities - summation
Probabilities - Balls and urns - 01
Non trivial identities - reshape
Remove collinear points in a set of 2D points defining a polygon
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