What number comes next in the series: 8, 17, 35, 71, 143, ?

💡 Solution & Explanation

Each term is the previous term × 2 + 1: 8 × 2 + 1 = 17, 17 × 2 + 1 = 35, 35 × 2 + 1 = 71, 71 × 2 + 1 = 143. So the next term is 143 × 2 + 1 = 287.