Let x, return 1 if x is a prime number, 0 otherwise
e.g x = 7, return y =1;
x = 6 return y = 0;
Back and Forth Rows
Back to basics 22 - Rotate a matrix
"Low : High - Low : High - Turn around " -- Create a subindices vector
Sum the Digits of a Number
Converts numbers into characters
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