This thread & the notes you've posted brilliantly illustrate why it is so vital (& worthy) to have a few strict
collector goals. So many collectors fret & worry about where their next note is going to come from (& for FV or dirt cheap). I've been guilty of this myself, so trust me folks I'm not judging anybody: its just often how we fall into this hobby. Luckily, about 15 years ago, I got a bit disciplined & started to weed out regular issue & started to focus only on special numbers, change-overs & replacements. I could still narrow down my focus some more.
Your "binary" serial number goal is very interesting & I think most of us enjoy the 'eye candy' serials posted.
Keep it going (no pressure!)