Search this site
Skip to main content
Skip to navigation
Martin's Maths
Home
The Arts, Fun and Entertainment
The Arts, Fun and Entertainment (1)
Maths in the Movies
Bend your brain
Digits of π
Unsolved Problems
Unsolved Problems (2)
Maths Oddities
Recommended Reading
Maths in Everyday Life
Maths in Art
A Wacky Circle
Fun with a Mobius Strip
The Arts, Fun and Entertainment (2)
The Witch of Agnesi
Peaucellier's Linkage
External Sites
Puzzles and Problems
Three Short Sharp Problems
A Scary Sum
The "Impossible Problem"
Hard or Easy
An Area Problem
Area Problem Solution
A Challenge
A Little Challenge - Solution
More Puzzles and Problems
Two More Number Problems
Great Circle Routes
Great Circle Routes - the Maths
Easier than it looks!
What's Your Number?
Taxicab Numbers
Taxicab Numbers Explained
Deficient, Abundant and Perfect Numbers
Deficient Numbers
Abundant Numbers
Perfect Numbers
Proofs and Demonstrations
Pythagoras
Area of a Circle
Cosine Rule
Sine Rule
Pythagorean Triples
Unsung Heroes and Heroines
The Sieve of Eratosthenes
Mathematical Humour
The Simpsons
Calvin and Hobbes
Resources
Useful Links (Websites)
Useful Links (Software)
Useful Links (Apps)
About Me
Contact Me
Martin's Maths
Deficient Numbers
Deficient Numbers.pdf
Google Sites
Report abuse
Page details
Page updated
Google Sites
Report abuse
Deficient Numbers.pdf