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77
A 77
A 77
Source:
May 25, 2007
Divisibility Theory
Problem Statement
Find all positive integers, representable uniquely as
x
2
+
y
x
y
+
1
,
\frac{x^{2}+y}{xy+1},
x
y
+
1
x
2
+
y
,
where
x
x
x
and
y
y
y
are positive integers.
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