1, 2, 3, 5, 6, 10, 15, and 30.
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1,2,5,6,10,15,and 33 Not quite: The list should include 3 and the last one should be 30 (not 33).
2,3,5
All numbers have factors. The whole number factors of a composite number are the integers that combine in a multiplication sentence to make that number. In the sentence 5 x 6 = 30, 5 and 6 are factors of 30.
The factors of 30 that are not prime numbers are 6, 10 and 30.
20: 1, 2, 4, 5, 10, 20 30: 1, 2, 3, 5, 6, 10, 15, 30