283期：02,03,07,09,10,11,12,14,16,17,18,19,22,23,24,26,27,28,29,30,33,34,35,36,40,42,46,49··（共半数）开18准
284期：01,03,04,08,09,10,11,13,14,15,17,18,19,20,21,23,24,25,26,28,31,32,35,37,38,39,40,42··（共半数）开20准
285期：01,02,04,05,07,11,12,13,14,16,17,19,20,22,23,27,28,29,30,34,36,38,39,42,43,44,45,48··（共半数）开06错
286期：04,06,07,09,10,11,12,13,14,16,17,18,22,24,27,29,30,32,34,35,36,37,38,39,40,44,46,47··（共半数）开48错
287期：02,04,06,10,12,13,14,15,17,20,22,23,26,28,29,31,33,34,35,37,39,40,42,43,44,46,47,49··（共半数）开04准
288期：05,08,09,10,12,13,14,16,17,19,20,23,25,27,28,29,32,34,35,36,37,38,39,41,43,47,48,49··（共半数）开？？！