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Multiply the first number by 3 to get the second number, subtract 5 from the second number to get the third number, multiply the third number by 3 to get the fourth number, subtract 5 from the fourth number to get the fifth number, ...

So the pattern is:

starting number, previous x 3, previous - 5, previous x 3, previous - 5, previous x 3

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16y ago

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