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Omni-MATH / Let S be the set of all ordered triples (p,q,r) of prime numbers for which at least one rational number x satisfies px²+qx+r=0. Which primes appear in seven or more elements of S?

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problem

Let SS be the set of all ordered triples (p,q,r)(p,q,r) of prime numbers for which at least one rational number xx satisfies px2+qx+r=0px^2 + qx + r =0. Which primes appear in seven or more elements of SS?
Plain-text mathematical notation (without MathML)
Let S be the set of all ordered triples (p,q,r) of prime numbers for which at least one rational number x satisfies px²+qx+r=0. Which primes appear in seven or more elements of S?
Original LaTeX notation
Let $S$ be the set of all ordered triples $(p,q,r)$ of prime numbers for which at least one rational number $x$ satisfies $px^2 + qx + r =0$. Which primes appear in seven or more elements of $S$?

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