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A220815 as a simple table

na(n)
12
23
35
411
513
617
719
823
931
1037
1141
1247
1353
1461
1567
1673
1779
1883
1989
2097
21101
22103
23107
24109
25131
26137
27139
28149
29151
30157
31163
32167
33179
34181
35191
36193
37199
38223
39229
40241
41251
42257
43263
44269
45271
46277
47283
48293
49307
50311

[2,3,5,11,13,17,19,23,31,37,41,47,53,61,67,73,79,
 83,89,97,101,103,107,109,131,137,139,149,151,157,
 163,167,179,181,191,193,199,223,229,241,251,257,
 263,269,271,277,283,293,307,311]