Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?

Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?

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1) Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?

2) 9, 27, 31, 155, 161, 1127, ?

3) 9, 17, 33, 65, ?

4) 7, 26, 63, 124, 215, 342, ?

5) 4, 7, 12, 19, 28, ?