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1. If number < 2 then not prime - end

2. If number == 2 then prime - end

3. If number divisible by 2 then not prime - end

4. If number divisible by 3 then not prime - end

5. If number divisible by 5 then not prime

6. end (It is not necessary to get any more complicated than this because you only need to check divisibility up to the square root of the number in question, and you only asked about numbers up to 20.)

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16y ago

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