Overview

tetrahedral number


Show Summary Details

Quick Reference

An integer of the form ⅙n(n+1)(n+2), where n is a positive integer. This number equals the sum of the first n triangular numbers. The first few tetrahedral numbers are 1, 4, 10 and 20, and the reason for the name can be seen from the figure.

Subjects: Mathematics.


Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.