I like to get up early and go for long runs on Sunday mornings. I also happen to be a huge fan of NPR’s Weekend Edition, so since that airs at 8, I like to be done with my run at around that time. In any case, I slept in last Sunday and didn’t finish my run until about 8:30 and while I was in the car I got to a hear a bit of the puzzle thing that they do. I typically hate that segment because…well, it’s Sunday and it’s early in the morning and this requires more brain power than I have at that hour.
But on the drive home I heard this puzzle for next week’s show:

A calculator displays a five-digit number. The first four digits are 8735. These digits form a logical sequence. What is the fifth number in the series?

Does anyone have an idea what this is? I had forgotten about the puzzle until about 20 minutes ago and now I can’t get it out of my mind. I typically see patterns quickly and I can’t figure this one out! Anyone?