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A042986 as a simple table

na(n)
12
23
35
47
511
613
717
823
931
1037
1141
1243
1347
1453
1561
1667
1771
1873
1983
2097
21101
22103
23107
24113
25127
26131
27137
28151
29157
30163
31167
32173
33181
34191
35193
36197
37211
38223
39227
40233
41241
42251
43257
44263
45271
46277
47281
48283
49293
50307
51311
52313
53317
54331
55337
56347
57353
58367
59373
60383

[2,3,5,7,11,13,17,23,31,37,41,43,47,53,61,67,71,
 73,83,97,101,103,107,113,127,131,137,151,157,163,
 167,173,181,191,193,197,211,223,227,233,241,251,
 257,263,271,277,281,283,293,307,311,313,317,331,
 337,347,353,367,373,383]