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A171688 as a simple table

na(n)
15
27
311
413
517
619
729
831
941
1043
1159
1261
1371
1473
15101
16103
17107
18109
19137
20139
21149
22151
23179
24181
25191
26193
27197
28199
29227
30229
31239
32241
33269
34271
35281
36283
37311
38313
39347
40349
41419
42421
43431
44433
45461
46463
47521
48523
49569
50571
51599
52601
53617
54619
55641

[5,7,11,13,17,19,29,31,41,43,59,61,71,73,101,103,
 107,109,137,139,149,151,179,181,191,193,197,199,
 227,229,239,241,269,271,281,283,311,313,347,349,
 419,421,431,433,461,463,521,523,569,571,599,601,
 617,619,641]