The list is infinite. All the multiples of 612 are divisible by 612, starting with: 612, 1224, 1836, 2448, 3060, 3672, 4284 . . .
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That would be 612. 68 is not divisible by 9 until it reaches 68x9, which is 612, so that makes it the LCM.
612 = 2*2*3*3*17.
The GCF for 612 and 18 is 18
612 18 x 34 6x3 17x2 2x3x3 17x2
All multiples of 306, which is an infinite number, including 306, 612, 918, 1224, 1530 . . .