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A078645
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
9
6
11
7
13
8
17
9
19
10
23
11
25
12
29
13
33
14
35
15
37
16
39
17
41
18
43
19
49
20
53
21
57
22
65
23
67
24
69
25
71
[1,2,3,5,9,11,13,17,19,23,25,29,33,35,37,39,41,43, 49,53,57,65,67,69,71]