Question

4,8,,28,80,244,? What next

Answer 1

the answer is 728
8×3=24+4=28
28×3=84-4=80
80×3=240+4=244
244×3=732-4=728

Answer 2

4 , 8 , 28 , 80 , 244 ,

3^1 +1 = 4
3^2 -1 = 9 -1 =8
3^3 +1 = 27+1 =28
3^4 -1 =81 -1 = 80
3 ^5 +1 = 243 +1 =244
3^6 -1 = 72 9-1 = 728