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double previous number
then alternately either add 1 or deduct 1
9 x 2 = 18 then + 1 = 19
19 x 2 = 38 then - 1 = 37
37 x 2 = 74 then + 1 = 75
75 x 2 = 150 then - 1 = 149
149 x 2 = 298 then + 1 = 299
299 x 2 = 598 then - 1 = 597
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