Any number of your choice. It is possible to find a quartic (order 4) polynomial that will fit the given 4 points and any other.
There is only one cubic that will do the trick:
Un = (-3n3 + 26n2 - 63n + 52)/2 for n = 1, 2, 3, ...
and according to it U5 = 6.
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24
32 The rule is to add 3n, where n is the number of the number in the series. (add 3, 6, 9, 12).
It is: 17+6 = 23
How about 3 followed by 12
In this series, the 1st, 3rd, and 5th numbers double as they progress, while the 2nd. 4th, and 6th number decrease by 4. That being the case, the next 2 numbers in the series would be 24, 4.