Which one of the numbers does not belong in the following series?
3, 4, 8, 9, 10, 18, 19, 38
You can check your solutions here
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Which one of the numbers does not belong in the following series?
3, 4, 8, 9, 10, 18, 19, 38
You can check your solutions here
justpuzzles 
10 does not belong. 3+1=4, 4×2=8, 8+1=9, 9×2=18, 18+1=19, 19×2=38