Some things I play around with for fun from time to time:

I am making some maps

First up: A map of the 10mi radius around the MBTA (bus+subway+CommuterRail), as I evaluated a decision to buy a folding bike I could bring on transit:

Next: Investigating how to get from Boston to NYC by stringing together 5 public transit systems

I maintain a personal DeFi wallet

I love being able to manage all my assets, in all my protocols, in one app. Existing solutions don't work smoothly enough for me, or don't cover all my needs, so something bespoke has been really nice to have. Let me know if you'd like access, but I make no promises about proper functionality or whether it fits your needs - I just hack on this for my own needs whenever I have the urge!

I explore math

• I found a Munchausen number that nobody seemed to know about across the Internet: 33 in base 17! Surprisingly low considering how high the known base-11 ones and up are (aside from 23 base 14). You can find the codebase here.
  • Actually, I found a second too! 6534 in base 20
  • And then 13 and 513 in base 25, and then also chose to graph them, which may make it into the Wikipedia page:
  • In general, it seems like most people went in the direction of "How can I search higher and higher numbers in low-ish bases?" whereas I was searching many bases and happy to sit in the lower search space.
  • I do suspect there's some way to generalise these. Munchausen numbers of a given base B are some combination of (B-1)^B-1 + (B-2)^(B-2) and so on, and there's probably a way to simplify the summing, similar to Gauss's method for summing numbers.
  • I was hoping that plotting the Munchausen numbers on a line would make that obvious, but it didn't exactly help on that front.