If you really want help with this problem, put together a small test suite that gives some inputs and some sample outputs (that you tabulate by hand) and wait for someone to produce a MATLAB function to do what you want.
This is an interesting problem. Acting as an administrator, I cleaned it up and added some tests.
The Goldbach Conjecture, Part 2
Return unique values without sorting
Make a random, non-repeating vector.
Sum of first n positive integers
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