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1,2,3,5,7,11,13,17,19,23,29,31....

A Prime number has exactly two factors.

2 is prime (its factors are 1 and 2)

3 is prime (its factors are 1 and 3)

5 is prime (its factors are 1 and 5)

1 is not prime (its only factor is 1, this is 1 factor, not 2)

4 is not prime (it has 3 factors: 1, 2, and 4)

6 is not prime (it has 4 factors: 1, 2, 3, and 6)

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13y ago
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Q: What numbers are prime from 1 2 3 4 5 6?
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