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A069688 as a simple table

na(n)
15
27
331
437
541
643
753
859
961
1067
1173
1279
1383
14101
15103
16139
17151
18157
19179
20197
21223
22241
23257
24263
25269
26271
27283
28293
29307
30311
31349
32353
33389
34421
35431
36461
37467
38491
39557
40593
41599
42601
43607
44631
45643
46647
47683
48691
49701
50727
51757
52769
53811
54827
55839

[5,7,31,37,41,43,53,59,61,67,73,79,83,101,103,139,
 151,157,179,197,223,241,257,263,269,271,283,293,
 307,311,349,353,389,421,431,461,467,491,557,593,
 599,601,607,631,643,647,683,691,701,727,757,769,
 811,827,839]