Not sure if it has a name but often there’s a trend of “one thing leads to another” related articles on the HN front page.

Yesterday there was something similar that might have planted a seed in your mind like it did for other people.

https://news.ycombinator.com/item?id=46735133

Right. Or it could be frequency illusion. Once you become aware of something, it appears to be more frequent:

https://en.wikipedia.org/wiki/Frequency_illusion

I definitely noticed this trend of article chaining, bu it must have been something else in this case, because i have absolutely 0 memory of seing that post yesterday. Actually, i think my thought came from an instagram video in my feed of a guy showing human division algorithm using sticks on a whiteboard.

or probably just some kind of preference/selection bias.

You own a red Mercedes now and suddenly you see only red Mercedes' on the streets.