0
Anonymous
0, 18, 36, ... -18, -36, ... Just start with 0 or some other multiple of 18, then add (or subtract) 18 at a time. To get larger multiples, multiply 18 with any integer; for example, 18 x 1000 = 18000.
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18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198 . . .