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Modni lanac | A Modern Chain #4

Prirodni brojevi n i n^2 završavaju jednakim slijedom od četiri znamenke \overline{abcd} gdje je a\neq0. Odredi \overline{abc}.
The natural numbers n and n^2 end with the same 4-digit sequence \overline{abcd}, where a\neq0. What is the value of \overline{abc}?