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A078715
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
10
6
19
7
20
8
30
9
50
10
100
11
190
12
200
13
300
14
500
15
1000
16
1900
17
2000
18
3000
[1,2,3,5,10,19,20,30,50,100,190,200,300,500,1000, 1900,2000,3000]