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Prime numbers are any numbers that are only divisible by one, and itself. For example, 3 is prime because the only numbers that go into it are 3 and 1. 6 isn't prime because not only can 6 and 1 go into it, but 3 and two can as well.

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The simplest thing is to use the Sieve of Eratosthenes: write out the positive integers in order (as many as you like) and then starting with 2, circle 2, and then cross off every second number (4, 6, 8, etc.) Then find the next unmarked number (3) and circle it, and cross off every third number (6, 9, 12, etc.) then find the next unmarked number (5) and repeat the process over and over.

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10y ago
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Q: How do you learn prime numbers?
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