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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 22 four-digit numbers are obtained with all their even digits and when divided by 22 four-digit natural numbers are obtained with all their odd digits.