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National and Regional Contests
Poland Contests
Poland - Second Round
2024 Poland - Second Round
1
1
Part of
2024 Poland - Second Round
Problems
(1)
Rational sequence
Source: Polish MO Second round 2024 P1
2/9/2024
Does there exist a rational
x
1
x_1
x
1
, such that all members of the sequence
x
1
,
x
2
,
…
,
x
2024
x_1, x_2, \ldots, x_{2024}
x
1
,
x
2
,
…
,
x
2024
defined by
x
n
+
1
=
x
n
+
x
n
2
−
1
x_{n+1}=x_n+\sqrt{x_n^2-1}
x
n
+
1
=
x
n
+
x
n
2
−
1
for
n
=
1
,
2
,
…
,
2023
n=1, 2, \ldots, 2023
n
=
1
,
2
,
…
,
2023
are greater than
1
1
1
and rational?
algebra