# tetrahedral number

## Primary tabs

Synonym:
triangular pyramidal number
Type of Math Object:
Definition
Major Section:
Reference

## Mathematics Subject Classification

### Sloan Sequences.

I've seen a recent high interest in integer pattern/sequence entries for PM. Most of these quote Sloane's On-line encyclopedia of integer sequences. As I play with the OEIS, I think it is a wonderful site that gives formulas, alternate formulas, related sequences, and loads of article references on just about every sequence you could imagine. I just wonder what value we are are adding in our PM entries?

Is there a way to contect these articles together into some interesting theorems from number theory? Make these entries a more connected part of the theoretical and applied entires on PM?

I fear we could never out do the exposition and depth of the Sloan index if we wish to serve simply as a catalogue. If I were searching for integer sequences on-line I would probably prefer to be directed quickly to Sloans index and by-pass PM, no offense meant to PM and its users, unless PM's articles truly brought out deeper understanding.

### Re: SloanE Sequences.

I see PlanetMath and SloanE's OEIS as complementary. The OEIS has the actual numbers, while PlanetMath has the formulas neatly typeset.

### Re: Sloan Sequences.

PlanetMath is not necessarily the place for "deeper understanding." It seems better suited for poseurs like me. I can write a thousand page book on prime numbers in which I use up the entire Greek and Hebrew alphabets for constant or variable names and the only numeric literals are the page numbers. It takes a genius like Neil Sloane to be bold enough to publish a math book filled with numeric literals.