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A064005
as a simple table
n
a(n)
1
2
2
3
3
4
4
5
5
7
6
9
7
11
8
12
9
17
10
19
11
23
12
25
13
29
14
31
15
37
16
41
17
43
18
47
19
49
20
53
21
59
22
61
[2,3,4,5,7,9,11,12,17,19,23,25,29,31,37,41,43,47, 49,53,59,61]