The composite numbers that are between 1 and 20 inclusive are:
4 6 8 9 10 12 14 15 16 18 20
This is a total of eleven composite numbers equal to 20 and below.
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3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.
There are 7 composite numbers greater than 20 and less than 30:21, 22, 24, 25, 26, 27, 28
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Composite numbers less than 70 and greater than 60 are 62, 63, 64, 65, 66, 68 and 69.
The composite numbers less than 20 are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18