This is a problem where there's probably a good built-in function, but I don't know it.
this will be hard to beat !
Project Euler: Problem 3, Largest prime factor
Back to basics 6 - Column Vector
Longest run of consecutive numbers
Max index of 3D array
Set a diagonal
Matrix indexing with two vectors of indices
middleAsColumn: Return all but first and last element as a column vector
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