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] -> 
middleAsColumn: Return all but first and last element as a column vector
Find the logic
Add two numbers
Sum of big primes without primes
Narcissistic number ?
Add more zeros
Find indices of diagonal elements
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