Look at the difference between each number and the next number.
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108
3467910 is a single number: it is not a pattern!
The next number is -21
The next number in the series 1 2 4 8 10 20 22 is
it is 31818 - 8 = 1010 - 4 = 66 - 2 = 44 - 1 = 3