Should there be a 16 in there somewhere? If so next three are 36, 49 and 64...
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100 200 20
25 36 49 64 81 100 121 144
45 then 58
23 21 (33 or 19)
This sequence is the squaring of the numbers 1, 3, 5, and 7. The next number is 9^2 = 81.