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Here are some counting numbers that have two different factors:

2 has 1 and 2

3 has 1 and 3

5 has 1 and 5

7 has 1 and 7

11 has 1 and 11

13 has 1 and 13

17 has 1 and 17

19 has 1 and 19

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15y ago

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