MathDB
A 52

Source:

May 25, 2007
quadraticsmodular arithmeticDivisibility Theorypen

Problem Statement

Let dd be any positive integer not equal to 2, 5, or 13. Show that one can find distinct aa and bb in the set {2,5,13,d}\{2,5,13,d\} such that abāˆ’1ab - 1 is not a perfect square.
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