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A260405 as a simple table

na(n)
15
27
313
417
519
623
729
811
919
1023
1131
1237
1341
1447
1553
1661
1767
1871
1973
2083
2189
22103
23107
24109
25113
26127
27137
28139
29149
30151
31157
32163
33179
34181
35191
36193
37197
3817
3923
4029
4137
4253
4359
4471
4573
4697
47101
48103
49107
50113
51127
52137
53139
54157
55163
56173
57179
58197
59199
60211
61223
62229
63257
64263
65271

[5,7,13,17,19,23,29,11,19,23,31,37,41,47,53,61,67,
 71,73,83,89,103,107,109,113,127,137,139,149,151,
 157,163,179,181,191,193,197,17,23,29,37,53,59,71,
 73,97,101,103,107,113,127,137,139,157,163,173,179,
 197,199,211,223,229,257,263,271]