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.
The Goldbach Conjecture
Project Euler: Problem 1, Multiples of 3 and 5
Sum of odd numbers in a matrix
Sum of series IV
Sum of series VII
Divisible by 4
Musical Note Interval 1 - Diatonic Scale
Cycling — Normalized Power
Divisible by 13
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