The composite factors of 63 are 9, 21 and 63.
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143
A composite number has three or more factors.
17 has no composite factors.
1 x 143 11 x 13
The factors of 121 are 1, 11, 121 The factors of 280 are 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280