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Start by adding 7, then add 7x2, then 7x4, then 7x8, etc.

2 + (7x1) = 9

9 + (7x2) = 23

23 + (7x4) = 51

51 + (7x8) = 107

The next number is 219.

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Q: What is the pattern rule for this pattern 2-9-23-51-107?
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