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## Intermediate Number TheoryNumber theory using algebraic techniques, multiplicative functions, Diophantine equations, modular arithmetic, Fermat's/Euler's Theorem, primitive roots, and quadratic residues. Much of the first half of the class emphasizes using the basic tools of the Introduction class in clever ways to solve difficult problems. In the second half, more theory will be developed, leading students to the beginning Olympiad level. |
12 weeks |

12 weeks ARE YOU READY? DO YOU NEED THIS? |

### Schedule

Spring 2020 | This course will be offered in Spring 2020. Click here to join our mailing list to be notified when the course schedule is available. |

### AoPS Holidays

There are no classes November 25–December 1, or December 21–January 3.

### Who Should Take?

Students should have a complete understanding of modular arithmetic, and a mastery of algebra through our Intermediate Algebra class (or a typical honors Algebra 2 class and some Precalculus) before taking this class.### Lessons

Lesson 1 | Introduction |

Lesson 2 | Bases |

Lesson 3 | Divisibility |

Lesson 4 | Divisors and Multiplicative Functions |

Lesson 5 | Prime Factorizations |

Lesson 6 | Algebra in Modular Arithmetic |

Lesson 7 | Linear Diophantine Equations |

Lesson 8 | Perfect Squares |

Lesson 9 | Fermat's Little Theorem and Euler's Theorem |

Lesson 10 | Orders and Primitive Roots |

Lesson 11 | Quadratic Residues and Squares |

Lesson 12 | Sums of Two Squares |