olymmath

KöMaL 2020 K655

    The four-digit numbers ABCD‾\overline{ABCD}, BCBA‾\overline{BCBA}, BDAB‾\overline{BDAB} and DDAD‾\overline{DDAD} are distinct four-digit primes (different letters denote different digits). Which numbers are they? You can use website http://matek.com/szamok/primszamok to check if a particular four-digit number is a prime number.

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