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Omni-MATH / Call admissible a set A of integers that has the following property:

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problem

Call admissible a set AA of integers that has the following property: If x,y∈Ax,y \in A (possibly x=yx=y) then x2+kxy+y2∈Ax^2+kxy+y^2 \in A for every integer kk. Determine all pairs m,nm,n of nonzero integers such that the only admissible set containing both mm and nn is the set of all integers. [i]
Plain-text mathematical notation (without MathML)
Call admissible a set A of integers that has the following property:
If x,y∈A (possibly x=y) then x²+kxy+y²∈A for every integer k.
Determine all pairs m,n of nonzero integers such that the only admissible set containing both m and n is the set of all integers.

[i]
Original LaTeX notation
Call admissible a set $A$ of integers that has the following property:
If $x,y \in A$ (possibly $x=y$) then $x^2+kxy+y^2 \in A$ for every integer $k$.
Determine all pairs $m,n$ of nonzero integers such that the only admissible set containing both $m$ and $n$ is the set of all integers.

[i]

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