28 = 2 x 14 and so on
23 is prime
33 = 3 x 11
47 is prime
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The only composite factor of 33 is 33.
26, 27, 28, 30, 32, 33, 34.
33 is a composite number. Its factors are 1, 3, 11, and 33.
The numbers 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39 and 40 are composite (including the boundaries).
The next four composite numbers after 30 are 32, 33, 34 and 35.