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.
Check if number exists in vector
Approximation of Pi (vector inputs)
Scrabble Scores - 11
Divisible by n, prime divisors (including powers)
Rule of mixtures (composites) - lower bound
Stress-Strain Properties - 6
Dice roll - opposite faces
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