81, 243, 729
The numbers are being multiplied by 3.
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3-1-.33 repeating
These are the whole numbers that go into 27 evenly: 1, 3, 9, 27.
The sequence continues : 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31. The sequence is odd numbers of increasing length based on exponents of 2. 1 1 3 (added the next 20 numbers) 1 3 5 7 (added the next 21 = 2 numbers) 1 3 5 7 9 11 13 15 (added the next 22 = 4 numbers) 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 (added the next 23 = 8 numbers)
1 & 27; 3 & 9.
Factors? 1, 3, 9, 27.