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
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Set some matrix elements to zero
Basic arrays operations.
Divisible by 11
Divisible by 13
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Rule of mixtures (composites) - lower and upper bounds
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