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A121837 as a simple table

na(n)
12
29
37
47
517
67
729
817
919
1023
1123
1213
1329
1479
1519
1689
1797
1853
1943
20347
21127
22127
23149
2429
25167
26331
27379
2861
2959
30167
31199
32557
33107
34113
3543
36191
37439
3841
39263
40227
41109
4271
43227
44137
45149
46409
47271
4853
49157
5079
51503
52103
53461
54137
55587
56233
57491
5873
59367
60233
61449

[2,9,7,7,17,7,29,17,19,23,23,13,29,79,19,89,97,53,
 43,347,127,127,149,29,167,331,379,61,59,167,199,
 557,107,113,43,191,439,41,263,227,109,71,227,137,
 149,409,271,53,157,79,503,103,461,137,587,233,491,
 73,367,233,449]