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A256863 as a simple table

na(n)
13
27
311
413
519
623
729
831
943
1047
1153
1259
1361
1467
1571
1673
1779
1883
1989
20103
21107
22109
23113
24127
25131
26139
27149
28151
29157
30163
31167
32173
33179
34191
35193
36199
37211
38223
39227
40229
41233
42239
43251
44263
45269
46271
47283
48293
49307
50311
51313
52317
53331
54347
55349
56353

[3,7,11,13,19,23,29,31,43,47,53,59,61,67,71,73,79,
 83,89,103,107,109,113,127,131,139,149,151,157,163,
 167,173,179,191,193,199,211,223,227,229,233,239,
 251,263,269,271,283,293,307,311,313,317,331,347,
 349,353]