The difference between five and eight is three.
The difference between 8 and 17 is 9.
17 and 44 differ by 27.
Did you get a look at him?
They are 1, 3, 9 and 27 respectively.
The number in the back is three times that in the front.
The fifth difference is 27*3=8 1.
This sequence should appear next.
44+8 1= 125