81 then 243
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64, 125 and 216
How about: 3*9 = 27 or 1*27 = 27
That series is the cubes of the counting numbers.
Let the second number be x, then the three consecutive numbers are x-1, x, x+1, and their sum is: (x-1) + x + (x+1) = 81 3x = 81 x = 27 So the three numbers are 27-1, 27, 27+1 = 26, 27, 28
1, 3, 9, 27.