None. There must be at least two given numbers for there to be a common multiple.
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The LCM of 1 and 7 is 7.
The LCM of 4 and 7 is 28
The LCM is 210.
The LCM of 14 and 28 is 28. The LCM of 7, 14 and 28 is 28.
The LCM of 7 and 5 is 35 because 7 x 5 is 35 and 5 x 7 is 35, so 35 is the LCM