1, 2, 3, 6, 9, 18, 27, 54
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
1, 2, 3, 6, 9, 18, 27, 54, 81, 162
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18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, . . . 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, . . .
18
Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. Factors of 54: 1, 2, 3, 6, 9, 18, 27, and 54. Common factors of 72 and 54 (numbers that are on both lists): 1, 2, 3, 6, 9, and 18.
18, 36, 54, 72, 90, 108, 126, 144, 162, 180
18, 36, 54, 72, 90. 24, 48, 72, 96, 120.