Soriaq a_n = (10^n-1)/9. Tukkiit d_n a_n immaqaat a_n+1 takornariaat. Kiagaq d_n inunngormat tapersersuutit?
Let a_n = (10^n-1)/9. D_n aappari uagut d_n a_n aallonik a_n+1. 
Uannut Euclidean Algorithm-mi, (a_n, a_n+1) = (a_n, a_n+1 - 10a_n).
Taqanngitsumik a_n+1 - 10a_n, (10^n+1-1)/9 - (10^n+1-10)/9 = 1. 
Taqanngitsumik d_n a_n+1 a_n aallonik ilinniartut, d_n 1-mut issormiujuq.