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TR-MO-R1 2015 Problem 26

    n>1n > 1 tam sayısının en büyük ve en küçük asal bölenlerinin toplamı f(n)f(n) olmak üzere, f(n)=n−23f(n) = n - 23 denklemini sağlayan kaç farklı n>1n > 1 tam sayısı vardır?

    a) 22 b) 33 c) 44 d) 55 e) 66

    Official text Turkish Mathematical Olympiad, first round 2015 official paper, page 8. Quoted with source.

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