173期：01,05,06,10,12,13,14,19,20,24,25,26,28,31,33,35,36,37,38,39,40,43,44,49··（共半数）开26准
174期：01,02,03,04,07,14,15,16,18,19,20,21,23,24,25,31,32,33,37,42,43,47,48,49··（共半数）开41错
175期：03,05,06,09,14,15,17,18,19,22,23,26,32,33,36,37,38,39,40,41,43,44,46,49··（共半数）开26准
176期：01,02,03,05,07,15,16,20,23,25,26,27,30,33,36,37,40,41,42,43,45,46,48,49··（共半数）开10错
177期：01,02,03,07,08,10,11,15,18,19,21,22,24,25,30,31,33,35,36,40,44,45,47,49··（共半数）开？？！