[gntech]

987654321 / 123456789 = 8 (to the 7th decimal place) is another nice one

[mihai_maruseac]

It's very close to 123456 * 8 + 6 = 987654 and the rest.

I just wrote an article on that (and the fact that this submission on HN exists, I was not expecting that)

https://mihai.page/ramblings-on-a-math-pattern/