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2,3,5,7,11,13,17 &19 - they're all the prime numbers !

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13y ago
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8y ago

They are the prime numbers of: 2 3 5 7 11 13 17 and 19

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8y ago

Such numbers are called prime numbers. They are 2, 3, 5, 7, 11, 13, 17, and 19.

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Q: What numbers between 1 and 20 only have 2 factors?
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