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A109580 as a simple table

na(n)
13
23
37
47
511
611
711
811
913
1013
1117
1217
1317
1417
1523
1623
1729
1829
1929
2029
2161
2261
2371
2471
2571
2671
2783
2883
2983
3083
3183
3283
33107
34107
35107
36107
37137
38137
39137
40137
41137
42137
43137
44137
45149
46149
47193
48193
49227
50227
51227
52227
53227
54227
55241
56241
57241
58241
59281
60281
61307

[3,3,7,7,11,11,11,11,13,13,17,17,17,17,23,23,29,
 29,29,29,61,61,71,71,71,71,83,83,83,83,83,83,107,
 107,107,107,137,137,137,137,137,137,137,137,149,
 149,193,193,227,227,227,227,227,227,241,241,241,
 241,281,281,307]