[6gvONxR4sf7o]

Can't have a list like that without a mention of Abramowitz & Stegun [0], or its successor, the NIST Digital Library of Mathematical Functions [1]. It's about as comprehensive as it gets.

[0] https://en.wikipedia.org/wiki/Abramowitz_and_Stegun

[1] https://dlmf.nist.gov/