Is there an online archive for various math formulas?

Question

What I'm looking for are archives of math formulas organized by topic or purpose etc. Basically an online library of math functions.

For instance, I'm currently working on a project where I have a range from 0 to 2^32 and I need a formula to divide this range consecutively from 1 to n so that for each step, every 1 to n accounts for a close to even floor interval. Basically, think of a load balancing problem where you have 1 to n nodes, and as you add and remove nodes, each node accounts for an even amount of the range (approximately).

Anyway, you don't have to answer the question in the 2nd paragraph. What I'm looking for is a source where I could do a search on my description and find a formula that matches. Other helpful resources for this (other than a math degree) are welcome.

Answer 1

Wolfram Math World: the web's most extensive mathematics resource

If you are looking for a specific algorithm, check this list of algorithms.

Answer 2

Mathworld is very useful. Also wikipedia has pretty good entries on math formulas, algorithms, and concepts.

Answer 3

Wolfram's MathWorld is decent, but I really prefer Wolfram's Functions Site. Of course, for your particular problem, I'm not exactly sure why simple rounding wouldn't suffice, but if you ever want to find a way to calculate inverse tangent using only inverse cosine and other elementary math functions, it's a library of math formulas, organized by topic / purpose that's easily searchable and provides mathematically accurate answers (quite uncommon on the web, I've found).

Answer 4

adding to the list, also, Casio has a site, interestingly enough.

Answer 5

Although not solely a repository of functions, MathOverflow looks like it will be a good resource (if I get the courage to expose my poor math skills to mathematicians).

Answer 6

What you are looking for is Neal Sloane's Online Encyclopedia of Integer Sequences.

And since you are in the Guelph area, set up coffee sometime with Dr. Dan Ashlock. He loves to talk about all things related to integer sequences and programming.