No.
122 + 162 = 400 = 202
so 12, 16, 20 would be a Pythagorean triple, but 12, 16, 18 would not.
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If you mean the three numbers, 12, 16, and 18 - try it out! Use a calculator to check whether 122 + 162 = 182 or not.
The greatest common factor of the numbers 12, 16 and 18 is 2.
the highest common factor of the numbers 12, 16 and 18 is 2.
There are probably tens of such sets. Some are: 5, 6, 7, 7, 8, 11, 13, 14, 15, 16, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 15, 16, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 14, 16, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 14, 15, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 15, 15, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 15, 16, 16, 18 5, 6, 7, 7, 7, 12, 12, 14, 14, 16, 16, 18
No 16 is deficient.12 and 18 are abundant.