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A179886 as a simple table

na(n)
11
21
37
47
515
615
731
831
939
1039
1155
1255
1371
1471
15111
16111
17119
18119
19151
20151
21175
22175
23177
24177
25231
26231
27239
28239
29255
30255
31303
32303
33311
34311
35313
36313
37319
38319
39329
40329
41335
42335

[1,1,7,7,15,15,31,31,39,39,55,55,71,71,111,111,
 119,119,151,151,175,175,177,177,231,231,239,239,
 255,255,303,303,311,311,313,313,319,319,329,329,
 335,335]