According to one possible rule, 80 is wrong and should be replaced by 30 and 90, making the sequence:
5, 15, 30, 90, 180, 540, 1080, ... with the rule "alternatively multiply by 3 and by 2 to get the next term".
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50 should be 49 as the count is by 8,16,24, 32
59 is the next number in this series.
One number does not make a sequence (nor a series).
Since the number series are not provided it is hard to know how to continue it. A person would need to see the following series to know the answer.
the missing number in the series 1,4,27.----.3125 is 81,35,729,256,115 .Please help to find the missing number.