The first number is 64, the second number is 32, the third number is 16, and the fourth number is 8. What is the number n?

The first number is 64, the second number is 32 (64 / 2 ^ 1), the third number is 16 (64 / 2 ^), and the fourth number is 8 (64 / 2 ^ 3),
The nth number is 128 / 2 ^ n

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