0
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Each number is three times the previous number.
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42 123 243
11, -10, 9
6, 15, 24, 33, 42, 51, 60
1 x 135, 3 x 45, 5 x 27, 9 x 15
-3 0 3 then 6 9 12 15 18 21 and so on ...