9+6+4+8/3+16/9+32/27+64/81

                   8     16      32    64                    216 + 144 + 96 + 64
9 + 6 + 4 + --- + ---- + ----- + ----    =   19 + ----------------------------
                   3      9       27     81                               81
                                                                     520
                                                      =   19 + ---------
                                                                      81
                                                                     
                                                                       34
                                                      =   19 + 6 -----
                                                                       81
                                                               34
                                                      =  25 ----
                                                               81