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en.wikipedia.org/wiki/Number_theory
Number theory or arithmetic [note 1] is a branch of pure mathematics devoted primarily to the study of the natural numbers and the integers. It is sometimes called ...

mathworld.wolfram.com/NumberTheory.html
Number Theory. Number theory is a vast and fascinating field of mathematics, sometimes called "higher arithmetic," consisting of the study of the properties of whole ...

www.britannica.com/topic/numbertheory
Number theory, branch of mathematics concerned with properties of the positive integers (1, 2, 3, …). Sometimes called “higher arithmetic,” it is among the ...

www.math.brown.edu/~jhs/frintch1ch6.pdf
Chapter 1 What Is Number Theory? Number theory is the study of the set of positive whole numbers 1;2;3;4;5;6;7;:::; which are often called the set of natural numbers.

science.howstuffworks.com/mathconcepts/numbertheory.htm
What is number theory? Learn how mathematicians use number theory to define relationships that underlie nature itself.

www.numbertheory.org/ntw
Number Theory Web. Aims; New Listings; Number theorists' Home Pages/Departmental listings; Things of Interest to Number Theorists; Search the Number Theory Web Pages

archives.math.utk.edu/topics/numberTheory.html
Absolute Primes ADD. KEYWORDS: Article, Repunits SOURCE: Arkadii Slinko, University of Auckland and Mathematics Olympiad Learning Centre TECHNOLOGY: Adobe Acrobat Reader

www.basicmathematics.com/numbertheory.html
Basic number theory. Get a strong understanding of the very basic of number theory. Life is full of patterns, but often times, we do not realize as much as we should ...

en.wikipedia.org/wiki/Category:Number_theory
Traditionally, number theory is the branch of mathematics concerned with the properties of integers and many of its open problems are easily understood even by non ...

www.math.brown.edu/~jhs/frint.html
Click on the links for the following material. Table of Contents, Preface, and Introduction; Chapters 1–6. Chapter 1: What Is Number Theory? Chapter 2: Pythagorean ...