4
A single number, such as 4642142824816 does not constitute a sequence.
The next numbers in the sequence are... 16, then 88.
14 08
17?
From the given sequence, the pattern appears to be 47-42=4, 42/3=14, 14*2=28, 28-4=24, 24/3=8, 8*2=16 and therefore the next number will be 16-4=12.
5
The next number in the sequence is 15 - the sequence goes x2, +2, -1
15
18
15.
15
15