101010 * 1 = 101010
111111 * 1 = 111111
121212 * 1 = 121212
131313 * 1 = 131313
141414 * 1 = 141414
151515 * 1 = 151515
161616 * 1 = 161616
171717 * 1 = 171717
181818 * 1 = 181818
191919 * 1 = 191919
不過好像下面兩個也可以
109890 * 9 = 989010
142857 * 2 = 285714