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27 is composite. 27 = 3 * 3 * 3 = 33
15 is composite. 15 = 3 * 5
21 is composite. 21 = 3 * 7
23 is a Prime number. It is only evenly divisible by itself and one.

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โˆ™ 2010-02-12 13:31:40
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