SOLUTION: How do I determine the next number in the following sequence: 131, 130, 127, 118 I know the answer is 81 but I cannot figure out how/why

SOLUTION: How do I determine the next number in the following sequence: 131, 130, 127, 118 I know the answer is 81 but I cannot figure out how/why

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Question 1023381: How do I determine the next number in the following sequence:
131, 130, 127, 118
I know the answer is 81 but I cannot figure out how/why
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
You are subtracting off increasing powers of three...
Minus 1, minus 3, minus 9, minus 27 gives 91, not 81.
There is a mistake somewhere.
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