1, 2, 3, 6, 7, 14, 21, 42
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There are 27 such numbers.
42 and 84
14 and 21
14 and 21
42 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.