The next number in the sequence would be 23. The sequence consists of prime numbers.
The next number is 4. 1, 3, 2, 5, 7, 4, 9, 11, 6
twenty three
23 25 28
23
22.5, 33.75, 50.625...
10
It is necessary to define "next" before the question can be answered.
5
6 and 10
100 200 20
11, -10, 9
18 34 66
10
14
Dart Board
-20, -14, 28