This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
select the primes of a vector
Is this triangle right-angled?
Vectors counting by 2
Sum of series V
Determine whether the input is divisible by 3 as well as 5
find a specific element from an matrix
Find remainder when x is divided by 3
multiply an array by its position number
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