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A069609 as a simple table

na(n)
17
21
39
43
53
63
717
87
911
1037
1111
129
1331
149
1517
1613
1793
183
19167
2067
21119
2293
2331
2433
25143
2699
27297
2891
2969
3083
311
3233
3323
3427
35199
36333
37123
38549
3917
4067
41141
4233
4339
44167
4521
46217
47279
48419
4969
50517
5171
52451
53171
5439
55191
5693
5743
5811
59303
60777
6133
6267
63207
64369
65489

[7,1,9,3,3,3,17,7,11,37,11,9,31,9,17,13,93,3,167,
 67,119,93,31,33,143,99,297,91,69,83,1,33,23,27,
 199,333,123,549,17,67,141,33,39,167,21,217,279,
 419,69,517,71,451,171,39,191,93,43,11,303,777,33,
 67,207,369,489]