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A268812
as a simple table
n
a(n)
1
2
2
3
3
5
4
7
5
11
6
13
7
17
8
23
9
31
10
53
11
59
12
61
13
89
14
191
15
277
16
283
17
887
18
1373
19
1979
20
3037
[2,3,5,7,11,13,17,23,31,53,59,61,89,191,277,283, 887,1373,1979,3037]