Interesting follow-up question: What is the distance between the set of harmonic numbers and the integers? i.e. is there a lower bound on the difference between a given integer and its closest harmonic number? If so, for which integer is this achieved?
And node seems to be used only as a dev dependency, to test, benchmark and build/package the project. If you'd be inclined you can use the project's code as-is elsewhere, i.e. in the browser.
FWIW I was also sceptical, but just tried it from my phone network and it seems indeed blocked. Wouldn't be the first case of different ISPs using different block-lists. c.f. bs.to