I got another mathematics beauty,hope you like it.
12345679 x 9=111111111
12345679 x 18=222222222
12345679 x 27=333333333
12345679 x 36=444444444
12345679 x 45=555555555
12345679 x 54=666666666
12345679 x 63=777777777
12345679 x 72=888888888
12345679 x 81=999999999