Directions for questions 2-3: There are two series given below, of which one is complete and follows a certain pattern. Based on the pattern of the complete series, find the answering term in the other series with missing terms marked by alphabets. Which number will come in place of D in the following? 4, 25, 169, 1009, 5041, 20161 / 6, A, B, C, D, E