243
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9 243 - 81 = 162 81 - 27 = 54 162 = 54 * 3 54 = 18 * 3 27 - 18 = 9
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
The next number is 48.
It is 3 followed by 1
Each number is found by dividing the previous number by 3. The next number would be a fraction called "one third", and then "one ninth" and so on.