They are members of the infinite set of numbers of the form n*k where n is an integer and k is the least common multiple of 12 and 42.
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The first 5 multiples of 42 are: 42, 84, 126, 168, and 210.
The multiples are 6, 12, 18, 24, 30, 36, 42, 48, 54 and just keep adding six.
Five multiples of 42 are 1, 2, 6, 7, 21, 42.
6 - 12 - 18 - 24 - 30 - 36 - 42 - 48
42 84 126