3, 10, 21, 36, 55, 70, 105?

More Questions from Odd Man Out and Series

• 4, 6, 8, 9, 10, 11, 12?
• 105, 85, 60, 30, 0, - 45, - 90?
• 8, 7, 11, 12, 14, 17, 17, 22, (...)?
• 8, 24, 12, 36, 18, 54, (...)?
• 15, 31, 63, 127, 255, (...)?
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• 16, 33, 65, 131, 261, (...)?
• 445, 221, 109, 46, 25, 11, 4?
• 19, 26, 33, 46, 59, 74, 91?
• 190, 166, 145, 128, 112, 100, 91?

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