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A068519 as a simple table

na(n)
12
22
33
47
55
613
77
819
923
1029
1111
1237
1313
1443
1547
1653
1717
1861
1919
2071
2173
2279
2323
2489
2597
26101
27103
28107
2929
30113
3131
32131
33137
34139
35149
36151
3737
38163
39167
40173
4141
42181
4343
44193
45197
46199
4747
48223
49227
50229
51233
52239
5353
54251
55257
56263
57269
58271
5959
60281
6161
62293

[2,2,3,7,5,13,7,19,23,29,11,37,13,43,47,53,17,61,
 19,71,73,79,23,89,97,101,103,107,29,113,31,131,
 137,139,149,151,37,163,167,173,41,181,43,193,197,
 199,47,223,227,229,233,239,53,251,257,263,269,271,
 59,281,61,293]