In general, this solution is not valid for single digit numbers.
code won't work for 0,4,8 I just took advantage of test code :(
If input n_str = < '9', then you get Error: Subscript indices must either be real positive integers or logicals.
Return the 3n+1 sequence for n
Finding Perfect Squares
Given an unsigned integer x, find the largest y by rearranging the bits in x
Area of a Square
Calculator spelling - Numbers to Letters
Temperature Conversion Utility (Strings)
Lights Out 10 - 5x5, with wrapping, 6 moves
Divisible by 9
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