1, 2, 3, 5, 6, 10, 15, 30
None missing.
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1 is a factor of 30
yesYes, 3 is a factor of 30.
No, 3 is not a factor of 40.
2^3 x 3
There is no such number. If a multiple of 4 is a factor of 30, then 4 must also be a factor of 30, but 4 is not a factor of 30 (the factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30), thus no such number exists.