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2014-10-16T11:35:51+03:00
2n + 1 | 6n + 18
2n + 1 | 2n + 1 (x3)

2n + 1 | 6n + 18
2n + 1 | 6n + 3
------------------------ ( - )
2n + 1 | 15 => 2n+1 ∈ D15
1 5 1