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Korea Junior Mathematics Olympiad
2006 Korea Junior Math Olympiad
5
5
Part of
2006 Korea Junior Math Olympiad
Problems
(1)
(m^2 + 20mn + n^2(/(m^3 + n^3) pos. integer when m,n coprime pos. integers
Source: KJMO 2006 p5
5/1/2019
Find all positive integers that can be written in the following way
m
2
+
20
m
n
+
n
2
m
3
+
n
3
\frac{m^2 + 20mn + n^2}{m^3 + n^3}
m
3
+
n
3
m
2
+
20
mn
+
n
2
ā
Also,
m
,
n
m,n
m
,
n
are relatively prime positive integers.
number theory
coprime
positive integers
Integers