28?
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16 21 22 29
The next number is 4.... Starting at 22, every alternate number is half the previous one. The same applies to 16.
The next number in the series 1 2 4 8 10 20 22 is
The next number is 17. You're adding 8, and then subtracting 5. So; 2 + 8 = 10 10 - 5 = 5 5 + 8 = 13 etc... 19 - 5 = 14 14 + 8 = 22 22 - 5 = 17
22