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.
Find the peak 3n+1 sequence value
Project Euler: Problem 10, Sum of Primes
Convert from Base 10 to base 5
Reverse the elements of an array
Divisible by 16
Inscribed Pentagon? 2
Lights Out 1 - 5x5, 3 moves
Divisible by n, prime divisors - 11, 13, 17, & 19
Sphenic number sequence
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