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Classical NT equation

Source: Bulgaria JBMO TST 2017 P1 Day 2

August 26, 2019
number theory proposednumber theory

Problem Statement

Find all positive integers a,b,c,d a, b, c, d so that a2+b2+c2+d2=13ā‹…4n a^2+b^2+c^2+d^2=13 \cdot 4^n
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