All elements of the set E of pairs of positive integers
Source: IMO LongList 1979 - P23
June 1, 2011
modular arithmeticnumber theory proposednumber theory
Problem Statement
Consider the set consisting of pairs of integers , with and , that satisfy in the decimal system the following properties:(i) is written with three digits, as , ;(ii) is written as for some ;(iii) is written as Find the elements of .