При каких натуральных n дробь (n-7)^2/n принимает натуральные значения?

Doctor yesterday I wrote a cure for the common cold.
Mother told the doctor that her son заболел.У him flu.
He said that he прлсужен due to my journey.
The doctor said that examine the patient.
Anna saw that Robert nodded her.

The doctor wrote me yesterday cold medicine. Mom told the doctor that her son zabolel.U the flu. He said that due to its very prlsuzhen trip. The doctor said he will examine the patient. Anna saw that Robert nodded her.