Stage: 3 Challenge Level: 
Find the missing number in this list:
10000, ? , 100, 31, 24, 22, 20, 17, 16, 15, 14, 13, 12, 11, 10.
Number theory. Factors and multiples. Number bases. Integers. Place value. Addition & subtraction. Mathematical reasoning & proof. Diophantine equations. Algebra - generally. Properties of numbers.
Published March 2000.
Copyright © 2007. University of Cambridge. All rights reserved.
NRICH is part of the family of activities in the Millennium Mathematics Project, which also includes the Plus and Motivate sites.
email: nrich@damtp.cam.ac.uk
