Secondly, it shows that Nim has not found an audience with people fond of mathematical and programming challenges. Run
There may be people interested in mathematics (and its applications) but not in programming challenges that are generally more attractive for students. When I was a student I implemented some of the Euler's challenges in Haskell and I think Ocaml (it's been along time), but today with a limited time I'm more interested at implementing things that are more useful and related to my work. I'm my self a "mathematician" (now converted to an ML and CV engineer) and I noticed that multiple members of the community are in fact scientists or work in domains related to ML. For the little story I followed rust for years looking at it as a replacement for C++, but was quiet disappointed with the lake of interest in scientific computing from the rust team (the language make it VERY hard and very ugly to work on generic numeric types + problems with the borrow checker). What interest me in Nim is precisely its potential for scientific computing. So I think this numbers should be taken with a grain of salt (but I agree with you that Nim is less popular than the languages you mentioned, lets hope this will change after v1.0)