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A135948
as a simple table
n
a(n)
1
2
2
3
3
5
4
7
5
17
6
23
7
37
8
41
9
43
10
47
11
53
12
59
13
61
14
67
15
71
16
73
17
79
18
89
19
97
20
241
21
479
22
571
23
673
24
853
[2,3,5,7,17,23,37,41,43,47,53,59,61,67,71,73,79, 89,97,241,479,571,673,853]