17.
2, 3, 3, 5, 10, 13, ?, 43, 172, 177

18.
9, 27, 31, 155, 161, 1127, ?

19.
2, 1, 2, 4, 4, 5, 6, 7, 8, 8, 10, 11, ?

20.
Which of the following will not be a number of the series 1, 8, 27, 64, 125,.....?

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