16, 33, 65, 131, 261, (….)

Question:
16, 33, 65, 131, 261, (….)

[A].

523

[B].

521

[C].

613

[D].

721

Answer: Option A

Explanation:

Each number is twice the preceding one with 1 added or subtracted alternatively.

So, the next number is (2 x 261 + 1) = 523.