Question

What comes next in the sequence;5,13,29,61?

Answer 1

5,13,29,61

5, 5×2+3 ,13×2+3 ; 29×2+3 ; 61×2+3
5,13,29,6; 125

Answer 2

Next number of the series is 253.

Solution:
1 * 2 + 3 = 2 + 3 = 5
5 * 2 + 3 = 10 + 3 = 13
13 * 2 + 3 = 26 + 3 = 29
29 * 2 + 3 = 58 + 3 = 61
61 * 2 + 3 = 122 + 3 = 125
So, 125 * 2 + 3 = 250 + 3 = 253.

Therefore, 1, 5, 13, 29, 61, 125, 253.