属于这两组的第一个数字:
10,21,121,323,767,989,56789,98767,98789,212321,232343,3456787,5432123,5656543,9876787,45678767,321012323,343212343,343456567,345676787,565654543,567654343,567656543,567676567,567676787,567678767,767656789,787676767,789878989,789898987,989878787,989878789.