The pattern in this series is not immediately apparent, as the numbers seem to be jumping around. However, upon closer inspection, we can see that the series alternates between adding and subtracting a specific number. The next number in the series should be 10, as we continue the pattern of adding and subtracting 1, 3, -3, 5, -5, 7, and so on.
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13
49 (it is an arithmetic series that adds 5 then 7 then 9 then 11 then 13)
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
They are: 33 29 25 21 17 13 9 a reduction of 4 each time
The next number in the series 1 2 4 8 10 20 22 is