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A042991 as a simple table

na(n)
12
23
35
47
513
617
719
823
929
1037
1143
1247
1353
1459
1567
1673
1779
1883
1989
2097
21103
22107
23109
24113
25127
26137
27139
28149
29157
30163
31167
32173
33179
34193
35197
36199
37223
38227
39229
40233
41239
42257
43263
44269
45277
46283
47293
48307

[2,3,5,7,13,17,19,23,29,37,43,47,53,59,67,73,79,
 83,89,97,103,107,109,113,127,137,139,149,157,163,
 167,173,179,193,197,199,223,227,229,233,239,257,
 263,269,277,283,293,307]