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.
Matrix indexing with two vectors of indices
How many trades represent all the profit?
Sum of series VI
Approximation of Pi (vector inputs)
Not square-free number sequence
Lights Out 11 - 5x5, with wrapping, x moves
Divisible by 14
Divisible by 2
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