Everything except 1, 2, 61 and 122
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1 and 3
4 is not a factor of 18 and is a factor of both 8 and 12
12 is a multiple of 3. It is not a factor of 6. 6 is a factor of 12.
A factor of a number is an integer that divides the number evenly (without remainder). So 2 and 3 are factors of 12 (12/2 is 6 and 12/3 is 4), but 7 is not a factor of 12 (12/7 is 1 remainder 5). 2 and 3 are not factors of 5 (notice 5 is prime).
Since 12 is a factor of 72, all of its factors are common.