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4digit no, ab - cd = cd -ba May Olympiad (Olimpiada de Mayo) 2011 L2 P2

Source:

September 28, 2021
number theoryDigits

Problem Statement

We say that a four-digit number abcd‾\overline{abcd} (a≠0a \ne 0) is pora if the following terms are true : ∙\bullet a≥ba\ge b ∙\bullet ab−cd=cd−baab - cd = cd -ba. For example, 20112011 is pora because 20−11=11−0220-11 = 11-02 Find all the numbers around.
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