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] -> 
Energy of a photon
Set the array elements whose value is 13 to 0
Find a Pythagorean triple
Generalised Hamming Number
Two functions (to be sure)
Longest Collatz Sequence
How many monitors are connected ?
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