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Well we have: 2,3,5,7,11,13,17,19,23,29. It really helps if you have the multiplication tables (to 12x12 for sure) memorized rock-solid. That way you can just look at a number (up to probably 60 or so) and just 'know' if it has any factors.

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13y ago
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Q: What is the tenth prime number?
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