Given a string, remove all the letters which in ASCII Code are prime numbers.
s1 = 'Determine which array elements are prime'
s2 = 'Dtrin which rry lnts r pri'
Additional test cases have been added.
Most nonzero elements in row
Project Euler: Problem 7, Nth prime
Multiply a column by a row
Add two numbers
Back to Basics - New Data Type in R2016b - convert a char to a string
Adding Cells with numbers defined as strings
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