TR-MO-R1 2016 Problem 20

Kaç $n \in \{12, 18, 42, 60, 72\}$ değeri için $1, 2, \ldots, n$ sayıları herhangi iki komşu sayının toplamı asal sayı olacak şekilde sıraya dizilebilir?

a) $1$ b) $2$ c) $3$ d) $4$ e) $5$

Official text Turkish Mathematical Olympiad, first round 2016 official paper, page 7. Quoted with source.

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