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A166466 as a simple table

na(n)
13
23
39
43
515
69
721
83
927
1015
1133
129
1339
1421
1545
163
1751
1827
1957
2015
2163
2233
2369
249
2575
2639
2781
2821
2987
3045
3193
323
3399
3451
35105
3627
37111
3857
39117
4015
41123
4263
43129
4433
45135
4669
47141
489
49147
5075
51153
5239
53159
5481
55165
5621
57171
5887
59177
6045
61183
6293
63189
643
65195
6699
67201
6851

[3,3,9,3,15,9,21,3,27,15,33,9,39,21,45,3,51,27,57,
 15,63,33,69,9,75,39,81,21,87,45,93,3,99,51,105,27,
 111,57,117,15,123,63,129,33,135,69,141,9,147,75,
 153,39,159,81,165,21,171,87,177,45,183,93,189,3,
 195,99,201,51]