This solution passes the test cases, yet it fails in general.
This solution would fail e.g. on a column vector a = randi(10, 100,1)
Project Euler: Problem 3, Largest prime factor
Replace all zeros and NaNs in a matrix with the string 'error'
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Mimic foldl in functional programming
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