180期:01,03,06,07,09,10,13,14,16,18,19,22,25,28,31,32,34,35,37,40,41,42,43,48··(共半数)开22准
181期:03,04,05,07,09,11,15,17,19,22,28,30,31,33,36,37,38,39,41,42,44,45,47,48··(共半数)开13错
182期:02,03,04,05,08,09,14,15,18,25,27,28,31,32,33,35,36,38,39,40,42,44,47,48··(共半数)开??!