TR-MO-R1 2020 Problem 26
pozitif bir tam sayı olmak üzere, in ile tam bölündüğü her tam sayısı için de ile tam bölünüyorsa, ye tuhaf sayı diyelim. Aşağıdakilerden hangisi bir tuhaf sayıdır?
a) 61 b) 63 c) 65 d) 67 e) 69
Official text Turkish Mathematical Olympiad, first round 2020 official paper, page 14. Quoted with source.
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