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] -> 
Sums with Excluded Digits
Sum all integers from 1 to 2^n
How to subtract?
Perfect Square or not
Rank of magic square (for beginners)
Add more zeros
Divisors for big integer
Generalised Hamming Number
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