A027889 - OEIS

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A027889 as a simple table

n	a(n)
1	1
2	3
3	9
4	27
5	37
6	81
7	111
8	333
9	999
10	2997
11	333667
12	1001001
13	3003003
14	9009009
15	12345679
16	27027027
17	37037037
18	111111111
19	333333333
20	999999999

[1,3,9,27,37,81,111,333,999,2997,333667,1001001, 3003003,9009009,12345679,27027027,37037037, 111111111,333333333,999999999]