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A105890 as a simple table

na(n)
15
27
323
429
531
637
747
853
961
1071
11101
12103
13109
14127
15149
16151
17157
18167
19173
20181
21191
22197
23223
24239
25263
26269
27271
28277
29293
30317
31349
32359
33367
34383
35389
36397
37421
38461
39479
40503
41509
42541
43557
44607
45613
46647
47653
48661
49677
50701
51719
52733
53743
54751
55757
56773
57797

[5,7,23,29,31,37,47,53,61,71,101,103,109,127,149,
 151,157,167,173,181,191,197,223,239,263,269,271,
 277,293,317,349,359,367,383,389,397,421,461,479,
 503,509,541,557,607,613,647,653,661,677,701,719,
 733,743,751,757,773,797]