I can find most of them by googling. XKCD seems to have their SEO down pretty well.
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SaveComengs@lemmy.federa.net 1 year agoxkcd readers remembering 8 billion comic id numbers:
Boinketh@lemm.ee 1 year ago
thedrivingcrooner@lemmy.world 1 year ago
You act like he has to pull it up with a number ID and doesn’t already have every xkcd alphabetically, pneumonically and categorically sorted in their bookmarks.