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.
Times 2 - START HERE
Flip the main diagonal of a matrix
How to subtract?
Arrange vector in ascending order
The sum of the numbers in the vector
Word Distance - Keyboard
Lights Out 14 - 5x5, four stages, x moves
Lights Out 26 - m x n, q stages, with wrapping, x moves
Lights Out 10 - 5x5, with wrapping, 6 moves
The 5th Root
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