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23 and 29

as

20 = 2 x 10

21 = 3 x 7

22 = 2 x 11

23 = prime

24 = 4 x 6

25 = 5 x 5

26 = 2 x 13

27 = 3 x 9

28 = 2 x 14

29 = prime

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7y ago
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