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A181577 as a simple table

na(n)
12
22
33
43
57
613
719
831
937
1041
1143
1247
1347
1453
1571
1689
1797
18103
19107
20109
21113
22113
23137
24139
25149
26151
27151
28157
29163
30181
31191
32197
33211
34227
35233
36239
37251
38257
39263
40263
41269
42271
43277
44293
45313
46347
47353
48359
49383
50389
51401
52421
53421
54433
55443
56463
57499

[2,2,3,3,7,13,19,31,37,41,43,47,47,53,71,89,97,
 103,107,109,113,113,137,139,149,151,151,157,163,
 181,191,197,211,227,233,239,251,257,263,263,269,
 271,277,293,313,347,353,359,383,389,401,421,421,
 433,443,463,499]