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A007915
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
17
16
18
17
19
18
20
19
21
20
22
21
23
22
25
23
26
24
28
25
29
26
30
27
31
28
33
[1,2,3,4,5,6,7,9,10,11,12,13,14,15,17,18,19,20,21, 22,23,25,26,28,29,30,31,33]