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.
Prime factor digits
It dseon't mettar waht oedrr the lrettes in a wrod are.
Generate a NaN...on purpose
Replace every 3rd element in a vector with 4
Divisible by 6
Divisible by 3
Lights Out 13 - 5x5, three stages, x moves
Tic-Tac-Logic - Solution Checker
Divisible by 16
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