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A107685 as a simple table

na(n)
12
23
35
43
57
65
713
811
919
1017
1131
1229
1343
1441
1561
1659
1773
1871
19103
20101
21109
22107
23139
24137
25151
26149
27181
28179
29193
30191
31199
32197
33229
34227
35241
36239
37271
38269
39283
40281
41313
42311
43349
44347
45421
46419
47433
48431
49463
50461
51523
52521
53571
54569
55601
56599
57619

[2,3,5,3,7,5,13,11,19,17,31,29,43,41,61,59,73,71,
 103,101,109,107,139,137,151,149,181,179,193,191,
 199,197,229,227,241,239,271,269,283,281,313,311,
 349,347,421,419,433,431,463,461,523,521,571,569,
 601,599,619]