FACTOID # 83: More than half of Indonesia's primary school teachers are under 30years of age .
 
 Home   Encyclopedia   Statistics   Countries A-Z   Flags   Maps   Education   Forum   FAQ   About 
 
WHAT'S NEW
RECENT ARTICLES
More Recent Articles »
 

FACTS & STATISTICS    Simple view

  1. Select countries to view: (hold down Control key and click to select several)

     

     

    Compare:

     

     
  1. Select fact or statistic: (* = graphable)

     

     

     

  2. (OPTIONAL) Compare to statistic: (both need to be graphable)

     

     

     

  3. View result as:

     

       
(OR) SEARCH ALL encyclopedia, stats & forums:   

Encyclopedia > Octahedral number

An octahedral number is a figurate number that represents an octahedron, or two pyramids placed together, one upside-down underneath the other. The octahedral number for n can be obtained by adding the n-1 and n square pyramidal numbers together, or by using the following formula:



The first few octahedral numbers are


1, 6, 19, 44, 85, 146, 231, 344, 489, 670, 891


  Results from FactBites:
 
85 (number) - Wikipedia, the free encyclopedia (242 words)
Eighty-five is an octahedral number, a centered triangular number, a centered square number, a decagonal number, and a Smith number.
The Saros number of the solar eclipse series which began on -170 March 14 and ended on 1110 April 20.
Further, the Saros number of the lunar eclipse series which began on -103 August 2 and ended on 1267 November 3.
  More results at FactBites »


 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments
Please enter the 5-letter protection code

Want to know more?
Search encyclopedia, statistics and forums:
 


Lesson Plans | Student Area | Student FAQ | Reviews | Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms.