8, 24, 12, 36, 18, 54, (...)?

More Questions from Odd Man Out and Series

• 15, 31, 63, 127, 255, (...)?
• 3, 7, 6, 5, 9, 3, 12, 1, 15, (...)?
• 16, 33, 65, 131, 261, (...)?
• 445, 221, 109, 46, 25, 11, 4?
• 19, 26, 33, 46, 59, 74, 91?
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