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13 la puterea 4n + 17 la puterea 4n+2 divizibil cu 10 .
Aflati n


Răspuns :

[tex](13^4)^n+(17^4)^n*17^2=28561^n+83521^n*289=\\ =\overline{...1}+\overline{...1}*289=\overline{...1}+\overline{...9}=\overline{...0}\vdots10[/tex]