Write a function that when given an odd number, produces an arrow-head function pointing to the right.
n = 3
n = 5
[ 1 0 0
0 1 0
0 0 1
1 0 0]
Create a square matrix of multiples
Rotate a Matrix
Determine the square root
Sum of odd numbers in a matrix
Replace multiples of 5 with NaN
Count up then down
Handle to an array of functions
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