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.
Multiples of a Number in a Given Range
223 Solvers
Area of an equilateral triangle
3026 Solvers
Sum of odd numbers in a matrix
327 Solvers
Sum the squares of numbers from 1 to n
169 Solvers
Number of Even Elements in Fibonacci Sequence
698 Solvers
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