2023 OIM Problems/Problem 6
Problem
Let be a polynomial of degree greater than or equal to 4 with integer coefficients. An integer
is called
-representable if there exist integers
and
such that
. Prove that, if for all
, more than half of the integers in the set
are
-representable, then all even integers are
-representable or all odd integers are
-representable.
Solution
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See also
https://sites.google.com/associacaodaobm.org/oim-brasil-2023/pruebas