0,2,8,14,?,34
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32 32 4 +4 = 8 8 + 6 = 14 14 + 8 = 22 22 + 10 = 32 The sequence starts at 4 and then adds 4, to get 8, then adds 6 to get 14, then adds 8, to get 22, so by extension the next number is 22 + 10. The number being added to the previous number in the sequence starts at 4 and rises by 2 each time.
21 between 13 and 34; it is the Fibonacci numbers where each successive number is the sum of the previous two.
The missing number is 1321!!! Simple Fibonacci row! 0+1=1 1+1=2 1+2=3 2+3=5 3+5=8 5+8=13 8+13=21 13+21=34 ......
34 (decimal) = 1 0 0 0 1 0
The answer will depend on where in the sequence the missing number is. It is not clear whether the dash is used as a minus sign or to separate numbers in the sequence.