nice (and difficult) problem! (if possible, please fix the testsuite adding something along the lines of "assert(n==numel(unique(c)))")
example of invalid solution
Project Euler: Problem 6, Natural numbers, squares and sums.
Back to basics 25 - Valid variable names
Restricted Addition v4
Restricted Addition v2
Restricted Addition v3
Restricted Addition v1
Restricted Multiplication v1
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