I suspect that there's much more of us here in the comments in general than you would recognize. As well as all other post-soviet math-schoolers. It's exactly the kind of education and attitude that makes a career of a senior engineer at FAANG or CTO at a VC-backed startup not only easy in a technical sense, but also a perfect cultural fit.

What does this number, and the other one, refer to?

In a soviet system, schools go by numbers first, and only sometimes have their own names.