243期：01,02,03,04,06,07,09,11,12,13,14,15,21,22,27,28,32,35,39,41,44,45,46,49··（共半数）开21准
244期：01,03,06,08,09,11,15,16,17,19,20,21,24,25,30,35,38,39,40,41,42,43,48,49··（共半数）开46错
245期：05,08,09,10,11,12,15,16,17,18,19,22,24,27,36,37,38,39,42,43,44,45,46,48··（共半数）开18准
246期：03,06,09,10,11,12,14,16,17,20,21,23,24,25,27,28,29,31,37,38,39,43,44,48··（共半数）开30错
247期：02,03,04,08,09,10,11,12,14,17,19,20,21,23,29,32,33,35,37,41,43,44,45,47··（共半数）开？？！