275期====03,04,05,06,08,12,15,16,19,20,22,23,24,25,27,31,32,33,34,35,36,38,39,42,44,47,48,49··（共半数） 中：31准
276期====03,05,06,08,10,11,12,14,16,18,19,23,26,28,29,33,34,36,37,39,40,42,43,44,46,47,48,49··（共半数） 中：01错
277期====01,03,04,05,06,07,13,15,16,18,19,20,23,24,27,28,30,31,32,34,38,39,40,42,44,45,47,48··（共半数） 中：？