308期：01,02,03,06,07,08,09,10,12,13,14,15,16,17,18,20,23,25,27,29,30,33,34,37,39,43,44,49··（共半数）开18准
309期：01,02,03,04,05,07,09,13,14,16,19,20,22,23,24,27,34,37,38,39,40,41,42,43,44,45,46,48··（共半数）开49错
310期：02,03,05,07,11,12,13,14,15,17,18,19,22,23,24,27,28,34,35,37,38,40,41,42,43,44,46,48··（共半数）开？？！