2, 3, 5, 8, 12, 17, ?
23
Look at the gaps between consecutive terms: \(3-2=1\), \(5-3=2\), \(8-5=3\), \(12-8=4\), \(17-12=5\).
The differences increase by one each time: 1, 2, 3, 4, 5, so the next difference is 6.
Therefore the next term is \(17 + 6 = 23\).
Hence, the missing number is 23.
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