They are member of the infinite set of numbers of the form 3108*k where k is an integer.
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They are all multiples.
222, 444, 666, 888, 1110
312 and 444's highest common factor is 12.
Those are known as "common multiples". The smallest POSITIVE of these common multiples is called the "least common multiple".
Common Multiples of 8:8,16,24,32,40,48,56,64,72,80,88 and 96 Common Multiples of 12:12,24,36,48,60,72,84 and 96