Question

I am trying to find a pattern in these numbers. I have looked for what feels like hours, and can't find it.

-3,-9,-14,-42,-47,-141
bren
-3 x -3 = -9 -9 +5 =-14 -14 x-3 =
-42 -42 + 5 = -47 -47 x -3 =
-141
bren
the next series would be
-141 + -5 = -146
-146 x -3 = -438