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]
Encode Roman Numerals
Determine if a Given Number is a Triangle Number
Create a Multiplication table matrix...
Area of a triangle
Apply a function array to an array of numbers
Get ranks of values in a vector
Count up then down
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