Art of Problem Solving
Art of Problem Solving
AoPS Online
Math texts, online classes, and more
for students in grades 5-12.
Visit AoPS Online ‚
Books for Grades 5-12 Online Courses
Beast Academy
Engaging math books and online learning
for students ages 6-13.
Visit Beast Academy ‚
Books for Ages 6-13 Beast Academy Online
AoPS Academy
Small live classes for advanced math
and language arts learners in grades 2-12.
Visit AoPS Academy ‚
Find a Physical Campus Visit the Virtual Campus

Pentagonal number

Revision as of 22:31, 17 October 2024 by Blue kite (talk | contribs)

A pentagonal number is a number that can be expressed in the shape of a pentagon. The formula for pentagonal numbers is \[(3n^2-n)\cdot\frac{1}{2}\]

Retrieved from "https://artofproblemsolving.com/wiki/index.php?title=Pentagonal_number&oldid=230119"