It is possible to find a polynomial of order 7 which will predict any number of your choice as the next number.
The following polynomial of order 6:
U6 = (6n6 - 142n5 + 1325n4 - 6180n3 + 15004n2 - 17663n + 7890)/30 will fit the above points and, for n = 8, predicts the next number as 323.
Alternatively, you have two inter-spliced series: odd terms increasing by one, even terms decreasing by one. Accordingly, the next term is 3.
11
11
11.
What would be the next number in this series 15 12 13 10 11 8?
14
26
These are square numbers. 12 × 12 = 144, 11 × 11 = 121, 10 × 10 = 100, 9 × 9 = 81, 8 × 8 = 64 so, 7 × 7 = 49 The next number is 49
11
11
11.
11
11
What would be the next number in this series 15 12 13 10 11 8?
11 comes next.
11 15 16
the answer is 1
14