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A108568 as a simple table

na(n)
12
23
35
49
513
617
721
825
933
1039
1145
1253
1357
1461
1569
1679
1785
1891
1999
20103
21109
22117
23125
24137
25147
26151
27155
28159
29163
30179
31195
32203
33209
34219
35229
36235
37245
38253
39261
40271
41277
42287
43297
44301
45305
46317
47339
48353
49357
50361
51369
52375
53385
54399
55409
56419
57425

[2,3,5,9,13,17,21,25,33,39,45,53,57,61,69,79,85,
 91,99,103,109,117,125,137,147,151,155,159,163,179,
 195,203,209,219,229,235,245,253,261,271,277,287,
 297,301,305,317,339,353,357,361,369,375,385,399,
 409,419,425]