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A205956 as a simple table

na(n)
13
27
313
419
531
637
741
843
947
1061
1167
1271
1373
1479
1597
16139
17313
18347
19349
20367
21373
22379
23397
24419
25439
26461
27463
28467
29479
30613
31619
32673
33719
34739
35919
36941
37947
38967
39971
403413
413461
423463
433467
443469
453613
463671
473673
483719
493739
503919
513943
523947

[3,7,13,19,31,37,41,43,47,61,67,71,73,79,97,139,
 313,347,349,367,373,379,397,419,439,461,463,467,
 479,613,619,673,719,739,919,941,947,967,971,3413,
 3461,3463,3467,3469,3613,3671,3673,3719,3739,3919,
 3943,3947]