21.
13, 32, 24, 43, 35, ?, 46, 65, 57, 76

23.
3, 15, ?, 63, 99, 143

24.
90, 180, 12, 50, 100, 200, ?, 3, 50, 4, 25, 2, 6, 30, 3

28.
563, 647, 479, 815, ?

29.
13, 35, 57, 79, 911, ?

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