Math Contests | 16 | An Expression Never Divisible by 121

preview_player
Показать описание
We prove that n^2 + 3n + 5 is not divisible by 121 for any positive integer n. This is problem 29 in the book

The USSR Olympiad Problem Book:
Selected Problems and Theorems of Elementary Mathematics
by Shklarsky, Chentzov, and Yaglom
1962
Рекомендации по теме
Комментарии
Автор

yay I solved it. My method was a bit different but it was also a contradiction proof

lgooch