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Write out the numbers 1 to 500 in 50 rows. Cross out 1. Start at 2 and cross out multiples of 2. That would eliminate all the rest of the even numbers. Go to the next uncrossed-out number (3) and cross out all of its multiples. Some of them will already be crossed out. You can stop by the time you get to 23. All of the uncrossed-out numbers are prime. Or you can download one of the many lists online.

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10y ago

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