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A038970 as a simple table

na(n)
12
23
35
47
511
613
723
831
953
1059
1173
1289
1397
14101
15127
16131
17137
18149
19151
20157
21167
22181
23191
24199
25227
26233
27257
28269
29281
30337
31359
32383
33389
34419
35421
36431
37433
38443
39449
40457
41461
42463
43479
44499
45523
46541

[2,3,5,7,11,13,23,31,53,59,73,89,97,101,127,131,
 137,149,151,157,167,181,191,199,227,233,257,269,
 281,337,359,383,389,419,421,431,433,443,449,457,
 461,463,479,499,523,541]