Complete the series 2, 5, 9, 19, 37.......

76 74 75 78

75

the pattern which is being followed is as follows: 2 x 2 + 1 = 5 5 x 2 - 1 = 9 9 x 2 + 1 = 19 19 x 2 - 1 = 37 37 x 2 + 1 = 75