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A042989 as a simple table

na(n)
12
23
35
47
511
617
719
823
931
1037
1147
1253
1359
1461
1567
1673
1779
1889
19101
20103
21107
22109
23131
24137
25149
26151
27157
28163
29173
30179
31191
32193
33199
34227
35229
36233
37241
38257
39263
40269
41271
42277
43283
44311
45313
46317
47331

[2,3,5,7,11,17,19,23,31,37,47,53,59,61,67,73,79,
 89,101,103,107,109,131,137,149,151,157,163,173,
 179,191,193,199,227,229,233,241,257,263,269,271,
 277,283,311,313,317,331]