Write a function that will multiply every prime number in the array or matrix by two, leaving all other numbers the same, and return that de-primed array or matrix. One will be treated as prime in this problem.
One in not prime!!!
And therefore should not become de-primed.
Implement a ROT13 cipher
Omit columns averages from a matrix
Project Euler: Problem 7, Nth prime
Rotate input square matrix 90 degrees CCW without rot90
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