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A155555 as a simple table

na(n)
111
219
331
441
559
661
767
871
9101
10103
11107
12109
13131
14137
15139
16149
17151
18181
19191
20199
21211
22241
23269
24281
25307
26311
27331
28349
29367
30389
31401
32409
33419
34439
35449
36457
37461
38463
39467
40479
41491
42499
43503
44509
45521
46569
47587
48599
49601
50613
51619
52641
53643

[11,19,31,41,59,61,67,71,101,103,107,109,131,137,
 139,149,151,181,191,199,211,241,269,281,307,311,
 331,349,367,389,401,409,419,439,449,457,461,463,
 467,479,491,499,503,509,521,569,587,599,601,613,
 619,641,643]