an = 2nSubstituting n = 1, 2, 3, 4, 5, we obtaina1 = 21 = 2a2 = 22 = 4a3 = 23 = 8a4 = 24 = 16a5 = 25 = 32Therefore, the required terms are 2, 4, 8, 16, and 32.