Răspuns :
[tex]\it 2^n+2^{n+2}+2^{n+4}+2^{n+6}=2^n(1+4+16+64)=2^n\cdot85[/tex]
[tex]\it D_{85}=\{1,\ \ 5,\ \ 17,\ \ 85\}\\ \\ \\ Deci,\ \ a\ \ se\ \ divide\ \ cu\ \ 5,\ \ cu\ \ 17,\ \ cu\ \ 85[/tex]
[tex]\it 2^n+2^{n+2}+2^{n+4}+2^{n+6}=2^n(1+4+16+64)=2^n\cdot85[/tex]
[tex]\it D_{85}=\{1,\ \ 5,\ \ 17,\ \ 85\}\\ \\ \\ Deci,\ \ a\ \ se\ \ divide\ \ cu\ \ 5,\ \ cu\ \ 17,\ \ cu\ \ 85[/tex]