PAETE.ORG FORUMS
Paetenians Home on the Net

HOME | ABOUT PAETE | USAP PAETE MUNISIPYO  | MEMBERS ONLY  | PICTORIAL PAETE | SINING PAETE  | LINKS  |

FORUM GUIDELINES
please read before posting

USAP PAETE Forum Index USAP PAETE
Discussion Forums for the people of Paete, Laguna, Philippines
 
 FAQFAQ   SearchSearch    UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

(Math) Special Numbers: Names for Numbers

 
Post new topic   Reply to topic   printer-friendly view    USAP PAETE Forum Index -> Science Lessons Forum
View previous topic :: View next topic  
Author Message
adedios
SuperPoster


Joined: 06 Jul 2005
Posts: 5060
Location: Angel C. de Dios

PostPosted: Mon Jul 31, 2006 12:09 pm    Post subject: (Math) Special Numbers: Names for Numbers Reply with quote






Names for Numbers
Ivars Peterson
29 July 2006

Recreational mathematics offers a vast playing field for amateur and professional mathematicians alike. It combines a sense of play with the joy of discovery. Sometimes, the results are mathematically trivial; occasionally, they lead to new mathematical insights.

Whole numbers or integers are often the subject of such pursuits. Once someone discovers an interesting pattern or type of behavior, those particular numbers are likely to earn a collective name. So we have numbers that are perfect, amicable, lucky, narcissistic, weird, and so on. Many of these names also commemorate people: Mersenne, Fermat, Fibonacci, Keith, Niven, Carmichael, Stirling, Catalan, Ruth-Aaron, Rhonda. And the list keeps growing!

One such curiosity came about in 1982 as the result of a telephone call. When phoning his brother-in-law, mathematician Albert Wilansky of Lehigh University noticed that the telephone number had a striking property.

The number, 493-7775 (4,937,775), is composite, meaning that it can be expressed as the product of prime numbers: 3 x 5 x 5 x 65,837. Interestingly, when the digits of the original number are added together, the result (42) equals the sum of the digits of the prime factors (3 + 5 + 5 + 6 + 5 + 8 + 3 + 7 = 42). This discovery marked the birth of Smith numbers, named for Wilansky's brother-in-law.

For the full article:

http://sciencenews.org/article.....thtrek.asp

*************************************************************

Questions to explore further this topic:

What is special about these numbers?

http://www.stetson.edu/~efriedma/numbers.html
http://www.math.wichita.edu/hi.....mbers.html

What are "named numbers"?

http://www.tanyakhovanova.com/Numbers/index.html

What are "perfect" numbers?

http://www.sciencenews.org/art.....thtrek.asp

What are "Fibonacci" numbers?

http://www.mcs.surrey.ac.uk/Pe.....ibnat.html

What are "Ruth-Aaron" pairs?

http://www.sciencenews.org/art.....thtrek.asp

What are "Smith" numbers?

http://www.shyamsundergupta.com/smith.htm

What are "Rhonda" numbers?

http://www.wschnei.de/digit-re.....mbers.html

What are "Fermat" numbers?

http://mathworld.wolfram.com/FermatNumber.html

What are special numbers?



"The Secret Life of Numbers" - George Szpiro

http://darwin.nap.edu/books/0309096588/html

GAMES

http://www.maa.org/news/mathgames.html
http://www.cs.uidaho.edu/~case.....games.html
http://www.enchantedmind.com/h.....zzles.html
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic   printer-friendly view    USAP PAETE Forum Index -> Science Lessons Forum All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group