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It is almost the Fibonacci sequence, which is 0 1 1 2 3 5 8 13 21 34 55 ...

1 + 2 = 3

2 + 3 = 5

3 + 5 = 8

5 + 8 = 13

So, the sequence is 1 2 3 5 8 13

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Q: What number is missing from 1 2 3 5 13?
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