Question

what is in the? 16,33,65,161,261.

Answer 1

Answer:

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

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

Answer 2

Hey mate
This follows the sequence x*2+/- 1
16
16*2+1 = 33
33*2-1 = 65
65*2+1 = 131
131*2-1 = 261
261*2+1 = 523
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