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.
Which values occur exactly three times?
Spot the outlier
Test if two numbers have the same digits
Oh Zero Zero Zero!!!
Max of a Vector
Rumis Scorer 2
5 Prime Numbers
Scrabble Scores - 6
Fill-a-pix - Solution Checker
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