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] -> 
Project Euler: Problem 10, Sum of Primes
vectorization in N
matrix of natural number
Is it an Armstrong number?
Find nth maximum
Find the path through the cell
Rank of magic square (for beginners)
Two functions (to be sure)
BLOCK x3 (Version 4)
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