Question

De terminaţi n apartine N, astfel incat 2n +1 sa fie divizior al lui13.
Pls help

Answer 1

2n+1∈D13
2n+1∈{1,13,-1,-13}
2n∈{0,12,-2,-14}
n∈{0,6,-1,-7}
n∈N⇒S:n∈{0,6}