Each number is 8 more than the preceding number.
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The sequence interval is 2 4 6 8 ( this is the difference of number). so the missing number is -1 if I'm not mistaken.
37.
These are in groups of 4, each in the sequence n, n-2, n-3, 2(n-3). So the series continues after 25: 23, 22, 44. So the number after 25 is 23
23
24