The next number in the series if the pattern continues is 158. You get the number through addition. You have to pay attention to how each number relates to the ones next it. Each number is six more than the last. For example: 128 + 6 = 134, 134 + 6 = 140, 140 + 6 = 146, and 146 + 6 = 152. So, 152 + 6 = 158.