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1-(2)3-(5)8-(11)19-(23)42-(?)?

0*2=1 = 1 1*2=2 + 1 = 3

2*2+1 = 5 + preceding number = 8

5*2+1 = 11 + preceding number = 19

11*2+1 = 23 + preceding number = 42

23*2+1 = 47 + preceding number = 89

so I think the answer is 89.

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Q: What number follows the sequence 1 3 8 19 42?
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