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A242988 as a simple table

na(n)
17
29
321
439
553
657
761
863
967
1069
11139
12149
13161
14163
15173
16187
17189
18201
19207
20219
21233
22247
23259
24269
25273
26279
27291
28293
29299
30301
31347
32363
33413
34447
35451
36453
37467
38473
39481
40511
41531
42537
43539
44549
45583
46609
47623
48629
49633
50637
51649
52663
53691
54697

[7,9,21,39,53,57,61,63,67,69,139,149,161,163,173,
 187,189,201,207,219,233,247,259,269,273,279,291,
 293,299,301,347,363,413,447,451,453,467,473,481,
 511,531,537,539,549,583,609,623,629,633,637,649,
 663,691,697]