The book "Workshop on the theory of numbers" by the authors Alexandrov V. A. and Gorshenin S. M. This is not just a textbook, but a real guide to the fascinating world of numbers, which opens up endless opportunities for the reader to study and understand one of the most ancient and interesting areas of mathematics. This edition will be an indispensable assistant for both students and teachers, as well as for all who seek to deepen their knowledge in number theory. Number theory is not just a set of formulas and theorems, but a whole universe where numbers behave like living beings, interacting with each other, creating amazing patterns and mysteries. In this puzzle book you will find a lot of tasks that will help you not only to consolidate theoretical knowledge, but also to develop analytical thinking. Each task is a challenge that requires not only mathematical skills, but also a creative approach. The book is aimed at students of mathematical and technical specialties, as well as at schoolchildren who are preparing for Olympiads and competitions in mathematics . It will be interesting to those who are fond of mathematics, wants to develop their abilities in solving non-standard problems and seeks to understand the deep connections between numbers. Adult readers who want to refresh their knowledge or just reflect on mathematical puzzles will also find a lot of interesting things in this manual. Authors, B. A. Alexander and C. M. Gorshenin, known for his deep knowledge and passion for mathematics They were able to create a manual that not only teaches, but also inspires . Their style of presentation is clear and accessible, which makes complex topics understandable even for beginners. In the book you will find both classical problems and modern approaches to solving, which allows you to see how number theory is applied in real life and in other areas of science. The topics raised in the "Number Theory Practitioner" cover a wide range: from prime and composite numbers to divisibility, Fermat and Euler theorems, as well as modern methods of cryptography based on number theory. Each chapter includes not only the theoretical part, but also practical tasks, which allows the reader to immediately apply the knowledge gained in practice. This makes the book especially valuable for those who are preparing for exams or want to deepen their knowledge in this area. The book also contains many examples and solutions, which allows the reader not only to independently test their strength, but also to learn from mistakes. This approach significantly increases the efficiency of learning and makes the learning process of mathematics more exciting. If you are looking for literature that will help you immerse yourself in the world of numbers, develop logical thinking and learn how to solve complex problems, the “Numbers Theory Practitioner” will become your reliable companion. This edition will not only enrich your knowledge, but also give you pleasure from the learning process. Thus, the book of Alexandrov and Gorshenin is not just a textbook, but a real find for everyone who wants to understand how numbers work and how they can be used to solve real problems. Do not miss the opportunity to discover the fascinating world of number theory, which awaits you on the pages of this wonderful guide!