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Q: Are 4 11 13 17 21 22 23 composite?

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21 and 28 are composite.

21 is a composite number, as it can be divided by 7 and 3. The other three numbers are prime numbers and do not divide into anything besides themselves.

composite numbers between 11 and 21:12 14 15 16 18

composite 3 and 119 7 and 51 17 and 21

21

The prime numbers between 10 and 21 are 11, 13, 17, and 19.

2 3 5 7 11 13 17 19

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Prime numbers: 11, 13, 17, 19, 23, 29 Composite numbers: 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30

9, 11, 13, 15, 17, 19, 21

11, 13, 15, 17, 19, 21, 23

They are all prime numbers except for 15 21 25 and 27 which are composite numbers

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