I also recommend that you wait that someone else solves your problem before posting your solution. Of course, you can solve a problem that you've created, and it is nice to share your view on it (since, in this case, there is probably more than one function that maps to these same values). However, posting this many problems and solving all of them reinforces the theory of spam.
So sorry, I didn't realize that you were creating a problem group. I still recommend that you wait that someone else solves your problem before posting your solution.
Moreover, problem 16 needs to be have more test cases or else it becomes trivial.
Find the numeric mean of the prime numbers in a matrix.
The Goldbach Conjecture
Who knows the last digit of pi?
Fill a zeros matrix
String Array Basics, Part 1: Convert Cell Array to String Array; No Missing Values
Find Logic 31
Find Logic 8
Find Logic 23
Cutoff OF Exam
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