9
243 - 81 = 162
81 - 27 = 54
162 = 54 * 3
54 = 18 * 3
27 - 18 = 9
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243
729 is the next number in the sequence. You times each number by the past number times by three e.g. 3x3=9, 9x3=27, 27x3= 243, 243x3=729
It is 3 times 81 = 243
It is 3 followed by 1
243