Digits, Squares, and Cycles
Library Home 
Full Table of Contents 
Suggest a Link 
Library Help
http://www.maa.org/mathland/mathtrek_2_2_98.html  


Ivars Peterson (MathTrek)  
Fascinating patterns lurk among the digits of whole numbers. Pick a positive integer, such as 57. Square each of the digits, then add the squares together: 5^2 + 7^2 = 25 + 49 = 74. Do the same thing with the digits of 74: 7^2 + 4^2 = 49 + 16 = 65. Keep repeating the procedure, using successive sums of squares...  


Levels:  Middle School (68), High School (912), College 
Languages:  English 
Resource Types:  Articles 
Math Topics:  Sequences and Sets 
[Privacy Policy] [Terms of Use]
© 19942014 Drexel University. All rights reserved.
http://mathforum.org/
The Math Forum is a research and educational enterprise of the Drexel University School of Education.