Chapter 1 Exploring Division
1.1 Greatest common divisor
1.2 Division Algorithm
1.3 Euclidean algorithm
1.4 Linear Diophantine equations
Chapter 1 Comprehensive Problems

Chapter 2 Prime Numbers and Factorization
2.1 Introduction to prime numbers
2.2 Prime number determination method
2.3 Properties of prime numbers
2.4 Least common multiple
Chapter 2 Comprehensive Problems

Chapter 3 Theory of Congruent Arithmetic
3.1 Joint Introduction
3.2 Congruent properties of multiplication
3.3 Solving linear congruences
3.4 The remainder of the Chinese theorem
3.5 Introduction to Factoring
Chapter 3 Comprehensive Problems

Chapter 4: Exploring Congruent Arithmetic with Law Decimals
4.1 Introduction to Fermat's Little Theorem
4.2 Wilson's Theorem
4.3 Composite numbers and pseudo-primes
4.4 Mersenne numbers
4.5 Perfect Numbers and the Sigma Function
Chapter 4 Comprehensive Problems

Chapter 5 Euler's Theorem, a Generalization of Fermat's Theorem
5.1 Euler Phi function
5.2 Euler's theorem
Chapter 5 Comprehensive Problems

Chapter 6 Primitive Roots and Indices
6.1 Order of integers for law n
6.2 index
6.3 Theory of indicators
6.4 Integers with primitive roots
Chapter 6 Comprehensive Problems

Chapter 7 Secondary Surplus
7.1 Introduction to Secondary Surplus
7.2 Legendre symbol
7.3 Secondary Mutual
7.4 Quadratic Reciprocity Law (LQR)
Chapter 7 Comprehensive Problems

Chapter 8 Nonlinear Diophantine Equations
8.1 Sum of two square numbers
8.2 Sum of four squares
8.3 Pell's equation
Chapter 8 Comprehensive Problems

A lively progression in the form of a 'question-answer' format
A book that allows anyone to study number theory easily and clearly.

This is a good book to start learning number theory.
The author, who has extensive experience teaching number theory, collected feedback from students and organized the content to accommodate students of all skill levels.
Because it is organized in a 'question-answer' format by selecting topics that students might be curious about while studying, even those who are studying number theory for the first time can easily approach it.
Complex and difficult concepts are explained more easily and enjoyably using a variety of pictorial materials.
To pique your interest, we also present brief biographies of mathematicians involved in key theories of number theory.
We also provide a variety of problems, from basic to advanced number theory, to help you develop problem-solving skills.
Anyone can easily and clearly understand number theory because it provides friendly and detailed explanations.