Solution
The logic here is
7 = 3 x 2 + 1
15 = 7 x 2 + 1
31 = 15 x 2 + 1
63 = 31 x 2 + 1
127 = 63 x 2 + 1
$$\therefore\ $$64 is the wrong number in the given series from the above pattern.
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