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A209085 as a simple table

na(n)
13
23
37
45
57
67
711
811
913
1031
1117
1219
1319
1423
1523
1623
1731
1831
1929
2031
2131
2237
2347
2441
2543
2643
2747
2847
2947
3053
3159
3259
3361
34127
3567
3667
3771
3871
3971
4079
4173
4279
4379
4479
4583
4683
4789
48127
4997
50103
51101
52103
53103
54107
55107
56109
57127
58113
59127
60127
61127
62127

[3,3,7,5,7,7,11,11,13,31,17,19,19,23,23,23,31,31,
 29,31,31,37,47,41,43,43,47,47,47,53,59,59,61,127,
 67,67,71,71,71,79,73,79,79,79,83,83,89,127,97,103,
 101,103,103,107,107,109,127,113,127,127,127,127]