Number sequences (Expert)

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Number sequences (Expert)

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Find the next number in each sequence.

1.7, 26, 9, 23, 11, 20, ?
2.10, 25, 18, 21, 26, 17, ?
3.5, 21, 7, 18, 9, 15, ?
4.9, 20, 11, 19, 13, 18, ?
5.2, 8, 32, 128, 512, ?
6.27, 32, 37, 42, 47, ?
7.4, 38, 8, 37, 12, 36, ?
8.4, 12, 16, 28, 44, ?
9.9, 33, 11, 29, 13, 25, ?
10.4, 7, 14, 25, 40, ?
11.22, 42, 62, 82, 102, ?
12.2, 10, 50, 250, 1250, ?
13.2, 6, 18, 54, 162, ?
14.8, 32, 16, 31, 24, 30, ?
15.15, 21, 28, 36, 45, ?
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