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A080173 as a simple table

na(n)
13
27
331
427
591
671
787
847
951
1011
1127
1227
1351
1427
1587
167
1751
1871
1991
207
2111
2251
2391
2471
2551
2611
2771
287
297
3011
3147
3287
3391
3427
3511
3651
3771
3891
3971
4047
417
4247
4371
4471
4527
4651
4711
4851

[3,7,31,27,91,71,87,47,51,11,27,27,51,27,87,7,51,
 71,91,7,11,51,91,71,51,11,71,7,7,11,47,87,91,27,
 11,51,71,91,71,47,7,47,71,71,27,51,11,51]