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A040974 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
37211
38223
39227
40229
41233
42239
43241
44257
45263
46269
47277
48283

[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,
 167,173,179,193,197,199,211,223,227,229,233,239,
 241,257,263,269,277,283]