[seanhunter]

Yes. Riemann gives them in the paper, including derivation, it’s just a bit annoying to type/read them here because hn doesn’t support mathjaxx.

https://www.claymath.org/wp-content/uploads/2023/04/Wilkins-...

[zombot]

I'm just not mathematician enough to convert that into a C function. Let alone one that is both efficient and reasonably accurate.