3 9 10 5 15 16 8 24 25
12,5
The cycle appears to be
Multiply by 3
Add 1
Divide by 2
So.......the series is
3 9 10 5 15 16 8 24 25 12.5
*3 +1 /2 *3 +1 /2 *3 +1 /2
