1.

16, 33, 65, 131, 261, (....)

Answer»

Each number is DOUBLE the former one with 1 included or SUBTRACTED then again.

Along these lines, the following number is (2 x 261 + 1) = 523.

Each number is double the former one with 1 included or subtracted then again.

Along these lines, the following number is (2 x 261 + 1) = 523.



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