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.
Reverse the Words (not letters) of a String
Rotate a Matrix by 90 degrees
Duplicate each element of a vector.
Area of an equilateral triangle
Integer Sequence - II : New Fibonacci
Lights Out 4 - 5x5, 8 moves
Divisible by n, prime vs. composite divisors
Stress-Strain Properties - 1
Self-similarity 2 - Every third term
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