481
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625
The series is decreasing by consecutive perfect squares starting from 16^2 (256) and decreasing by 2^2 each time. Therefore, the next number in the series would be 4^2, which is 16.
24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
24
The pattern is - 5 then +2. 2 and 4 are the next numbers in the series.