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My problems are the prime number algorithm and my sexy prime pairs im a little unsure as to how to calculate them and I understand my attempts to do so have not been very good.

My major problem is calculating the prime numbers using the sieve of eratosthenes algorithm. How do I Loop through the factors and mark them like and unmark them if they are prime?

So I have been given a problem in class stating that I had to calculate the sexy prime pairs. I have to use the sieve of eratosthenes alogorithm and a array to calculate the prime numbers and then...