What will come in place of the question mark (?) in the following number series? 256, ?, 190, 167, 148, 131

Given number series 131 + 17 = 148 148 + 19 = 167 167 + 23 = 190 190 + 29 = 219 219 + 37 = 256

Here addition is based on 17 + 2= 19, 19 + 4 = 23, 23 + 6 = 29, 29 + 8 = 37