832
let first term = n
second term = 2 x n
third term = 4 x n
forth term = 8 x n
therefore we can concluded that the multiple are the sum of itself ( 2+2= 4, 4+4=8, 8+8=16, 16+ 16=32,) some the seventh term will be 32 + 32 which is 64 .
therefore
seventh term = 64 x n
= 64 x 13 = 832