Math function treasure trove: NIST Digital Library Of Math Functions

Recently, I was searching for a way to convert LaTeX into XHTML format and in the process I found the NIST Digital Library Of Math Functions
Here is the index:

NIST Digital Library Of Math Functions 

When you are in the need of a proper function, the best option is to start from a respectable version.  NIST is a tireless engineering and science bastion on the overwise random nature of the internet.