81 = 3 x 27
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Each number is three times the previous number.
81 8+1=9 9*9=81
81 is 72 more than 9 81 is 9 times 9
three
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