4-digit number wanted with 2 even and 2 odd digits
Source: VI May Olympiad (Olimpiada de Mayo) 2000 L1 P1
September 22, 2022
number theoryDigits
Problem Statement
Find all four-digit natural numbers formed by two even digits and two odd digits that verify that when multiplied by four-digit numbers are obtained with all their even digits and when divided by four-digit natural numbers are obtained with all their odd digits.