1 5 9 13 17 21
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Fibonacci sequence
The terms in the sequence are increasing by 0.08 every time. In this case, the next two terms in the sequence are 1.32 + 0.08 = 1.40 and 1.40 + 0.08 = 1.48.
It is 4374
Double it every time and so the next number will be 80
-1 -3