При каких целых значениях n значение выражения (n-3)²÷n² .является целым числом?

Решение
При каких целых значениях n значение выражения (n-3)²÷n² .Является целым числом?
(n-3)²÷n² = (n - 3 - n)*(n - 3 + n) = -3*(2n - 3)
всё выражение будет целым, если n -- целое число

280/45                  541/67                      818/23           623/76            330/62
270  6,2222           536 8,07462686         69  35,55       608 8,197        310 5,322
  100                         500                       128                 150                 200    
     90                        469                        115                  76                 186   
                                  310                         130                740                 140                                             268                                              684                 124 
                                     420                                              560                 160     
                                      402                                              532                 124
                                         180
                                         134
                                           460
                                            402
                                              580
                                               536
                                                440
                                                  402                   

280/45                  541/67                      818/23           623/76            330/62
270  6,2222           536 8,07462686         69  35,55       608 8,197        310 5,322
  100                         500                       128                 150                 200    
     90                        469                        115                  76                 186   
                                  310                         130                740                 140                                             268                                              684                 124 
                                     420                                              560                 160     
                                      402                                              532                 124
                                         180
                                         134
                                           460
                                            402
                                              580
                                               536
                                                440
                                                  402