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Arcata CA (2n + 5,3n+ 7)=1

Răspuns :

d ( un numar ) ≠ 1 
d | 2n+5 => d|3 (2n+5) => d|6n+15
d| 3n+7 => d| 2(3n+7) => d| 6n + 14
d|6n+ 15 - (6n + 14) => d | 1 => d = 1 .