Any multiple of 105.
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Multiples of 3 are 3, 6, 9 and so on. Multiples of 7 are 7, 14, 21 and so on. The common multiples of 3 and 7 include 21, 42, 63 and so on.
315
The LCM of (5, 6, 7) is 210.
35 and 70 both have 7 and 5 as prime factors
Any multiple of 420