數字的藝術

1*8+1=9
12*8+2=98
123*8+3=987
1234*8+4=9876
12345*8+5=98765
123456*8+6=987654
1234567*8+7=9876543
12345678*8+8=98765432
123456789*8+9=987654321

1*9+2=11
12*9+3=111
123*9+4=1111
1234*9+5=11111
12345*9+6=111111
123456*9+7=1111111
1234567*9+8=11111111
12345678*9+9=111111111
123456789*9+10=1111111111

9*9+7=88
98*9+6=888
987*9+5=8888
9876*9+4=88888
98765*9+3=888888
987654*9+2=8888888
9876543*9+2=88888888
98765432*9+1=888888888
987654321*9+0=8888888888

1*1=1
11*11=121
111*111=12321
1111*1111=1234321
11111*11111=123454321
111111*111111=12345654321
1111111*1111111=1234567654321
11111111*11111111=123456787654321
111111111*111111111=12345678987654321