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A339699 as a simple table

na(n)
15
223
325
431
541
643
747
853
967
10101
11109
12113
13127
14137
15141
16149
17155
18187
19191
20195
21203
22209
23253
24275
25317
26322
27329
28367
29389
30409
31415
32503
33537
34565
35613
36623
37637
38643

[5,23,25,31,41,43,47,53,67,101,109,113,127,137,
 141,149,155,187,191,195,203,209,253,275,317,322,
 329,367,389,409,415,503,537,565,613,623,637,643]