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49th Mathematical Olympiad in Ukraine

Ukraine algebra

Problem

Does there exist a polynomial satisfying simultaneously the following conditions: , has 3 integer roots and is a prime number.
Solution
Let be a polynomial which satisfies the necessary conditions. Then are integer numbers and is a prime number. Without loss of generality we have and is a prime, it follows . The nearest prime numbers for are and then . Therefore . A contradiction.
Final answer
No

Techniques

Vieta's formulasPolynomial operationsPrime numbers