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3, 7, 15, 31, ?, 127
3, 7, 15, 31, ?, 127
63
64
61
65
Explanation
3 × 2 + 1 = 7
7 × 2 + 1 = 15
15 × 2 + 1 = 31
31 × 2 + 1 = 63
63 × 2 + 1 = 127