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Omni-MATH / Let K be the set of all positive integers that do not contain the digit 7 in their base- 10 representation. Find all polynomials f with nonnegative integer coefficients such that …

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problem

Let KK be the set of all positive integers that do not contain the digit 77 in their base- 1010 representation. Find all polynomials ff with nonnegative integer coefficients such that f(n)∈Kf(n)\in K whenever n∈Kn\in K .
Plain-text mathematical notation (without MathML)
Let K be the set of all positive integers that do not contain the digit 7 in their base- 10 representation. Find all polynomials f with nonnegative integer coefficients such that f(n)∈K whenever n∈K .
Original LaTeX notation
Let $K$ be the set of all positive integers that do not contain the digit $7$ in their base- $10$ representation. Find all polynomials $f$ with nonnegative integer coefficients such that $f(n)\in K$ whenever $n\in K$ .

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