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Each number is obtained by doubling the previous number and then subtracting a number that itself keeps doubling:

15 times 2 is 30, minus 1 is 29

29 times 2 is 58, minus 2 is 56

56 times 2 is 112, minus 4 is 108

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Q: What is the number pattern for 15 29 56 108?
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