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.
Distance walked 2D
Project Euler: Problem 9, Pythagorean numbers
Find a subset that divides the vector into equal halves
Divisible by 3
Lights Out 10 - 5x5, with wrapping, 6 moves
5 Prime Numbers
Temperature Conversion Utility (Strings)
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