Find the Missing Number: 2, 5, 10, 17, ()

The pattern in the sequence is that each number is obtained by adding the next odd number.

Starting with 2, we add 3 (the next odd number) to get 5. Then, we add 5 (the next odd number) to get 10. Next, we add 7 (the next odd number) to get 17. To find the next number, we add 9 (the next odd number) to get 26.