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A031377 as a simple table

na(n)
12
27
317
429
541
653
767
879
997
10107
11127
12139
13157
14173
15191
16199
17227
18239
19257
20271
21283
22311
23331
24349
25367
26383
27401
28421
29439
30457
31467
32491
33509
34541
35563
36577
37599
38613
39631
40647
41661
42683
43709
44733
45751
46769
47797
48821
49829
50857
51877

[2,7,17,29,41,53,67,79,97,107,127,139,157,173,191,
 199,227,239,257,271,283,311,331,349,367,383,401,
 421,439,457,467,491,509,541,563,577,599,613,631,
 647,661,683,709,733,751,769,797,821,829,857,877]