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A081961 as a simple table

na(n)
15
213
325
441
561
665
785
889
997
10113
11145
12149
13157
14181
15169
16185
17193
18221
19205
20233
21265
22269
23277
24313
25289
26317
27305
28365
29337
30353
31377
32421
33389
34425
35433
36481
37425
38445
39485
40461
41493
42545
43481
44505
45521
46557
47613
48541
49569
50617
51685
52689
53629
54653

[5,13,25,41,61,65,85,89,97,113,145,149,157,181,
 169,185,193,221,205,233,265,269,277,313,289,317,
 305,365,337,353,377,421,389,425,433,481,425,445,
 485,461,493,545,481,505,521,557,613,541,569,617,
 685,689,629,653]