Replicate each element of a row vector (with NaN) a constant number of times.
n=2, A=[1 2 3] -> [1 1 2 2 3 3]
n=0, A=[2 1] -> 
Test for balanced parentheses
How long is the longest prime diagonal?
Is this triangle right-angled?
Create a vector
Divisible by 2
Expression or variable?
Rank of magic square (for beginners)
Find the path through the cell
Longest Collatz Sequence
Two functions (to be sure)
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