Senior Teacher, Faculty of Applied Mathematics and informatics, Samarkand State University, Uzbekistan. Email id: nizamova-n-n@rambler.ru
Online published on 10 August, 2020.
The article provides information about the "Friendly Numbers" studied in the "Number Theory" section of mathematics and the history of their development, the criteria for finding friendly numbers, scientific research of Eastern and European mathematicians in determining friendly numbers. The article is intended for high school students, academic lyceums, university students and teachers of secondary schools specializing in mathematics.
Friend numbers, Pythagoras, Thabit ibn Qurra criterion, Al-Kashi criterion, Mahmud al-Wasudi criterion, Euler method
