I’m feeling a bit guilty about this (in so far as I ever feel guilty about anything). A while back I asked both of my readers the meaning of this cryptic message:
Yes, that is Z9 by the way. And Y5. I find the sequence fascinating. And I use it every year when I build our Christmas tree. It’s the installation order of the individually marked “branches” that clip onto the central core. If I get the order wrong the tree gets bigger as it gets higher, which is not a look that I like. I’ve no idea why the numbers are the way they are, or the mysterious need to go off into different letters and numbers in the middle of the sequence. But now it is on the blog at least I’ll not lose it for a while.