polygonal

NodeJs module for getting polygonal numbers

The Polygonal Numbers

Polygonal numbers are numbers that can be arranged in a regular polygon if they're represented as dots.

eg.:

Triangular numbers

Formula

The formula to get the nth polygonal number of a s-sided polygon is:

Installation

This module is on the npm repository, to intall it run the following command

$ npm install polygonal

Usage

var polygonal = require('polygonal');
 
// get the second pentagonal
var x = polygonal.getSGonal(5, 2);
var y = polygonal.getPentagonal(2);
 
// x is equal to y!!

References

http://en.wikipedia.org/wiki/Polygonal_number