This reminds me I've been curious to know what Hackernews people walk around with. I memorized 18 digits of Pi in highschool that I still remember and sometimes use as a bad joke here and there. But curious how many digits people here walk around remembering, specially if you aren't into competitively doing it (which I found out later is a thing).
I memorised the sqrt of 2 in highschool to impress the teacher. The first 32 digits eventually became part of my passwords, but significantly reduced nowadays because I kept running into too many length restricted invalidations.
100 + a few now (since age ~15). I briefly knew 400, but didn't put in the practice to keep it (some sections of those later 100s are still there, but I can't access them as I'm missing some digits in between). It takes about 40min. to get 100 new digits into my head (just straight repetition, paying attention to the sounds and patterns in rhythmic groups). Keeping them long-term requires a lot of time spent on spaced repetition. I run through the first 100 digits just a few times a year now, and it's all still easily there.
I memorized and forgot 50 digits of Pi after doing some memory training game. Was a cool bar trick but ultimately lost my memory palace discipline. I might be able to pull out some percentage of accuracy if I focused but it feels fairly pointless.
