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n个数(a(n))9*n
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2: 99 18 9*2
3: 10989 27 9*3
4: 1109889 36 9*4
5:111098889 45 9*5
6: 11110988889 54 9*6
7: 1111109888889 63 9*7
8: 111111098888889 72 9*8
9: 11111110988888889 81 9*9
10: 1111111109888888889 90 9*10
11: 111111111098888888889 99 9*11
12:111111111 09888888889 108 9*12等。
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