39738

The smallest chain oviosly started with the lowest number so it must of been 2,4,8,16.The next one i started at 10 and went up from that number and when finnaly i couldnt go any higher i stopped.I stopped at 12 so it was 12,24,48,96.
Prime numbers wouldnt of worked bucause the only factors of it are 1 and it self.The largest difference of numbers started at 2 and went all the way to 96.
It went like this 2,24,48,96.The next question had the same anwser as the one before and the last anwser was the same as the first