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.
Number of 1s in a binary string
Duplicate each element of a vector.
Change the sign of even index entries of the reversed vector
sum of first 'n' terms
Dice roll - lateral faces
Lights Out 15 - 5x5, broken buttons I
Approximation of Pi (vector inputs)
Lights Out 5 - 5x5, 10 moves
Lights Out 11 - 5x5, with wrapping, x moves
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