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A081883 as a simple table

na(n)
15
29
321
437
546
649
753
869
985
10101
11113
12117
13121
14133
15137
16149
17165
18174
19177
20181
21197
22213
23217
24229
25241
26245
27261
28265
29277
30293
31302
32305
33309
34313
35325
36341
37357
38369
39373
40389
41393
42405
43421
44430
45433
46437
47441
48453
49469
50485
51497
52501
53517
54521

[5,9,21,37,46,49,53,69,85,101,113,117,121,133,137,
 149,165,174,177,181,197,213,217,229,241,245,261,
 265,277,293,302,305,309,313,325,341,357,369,373,
 389,393,405,421,430,433,437,441,453,469,485,497,
 501,517,521]