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A260940 as a simple table

na(n)
13
25
37
47
511
613
713
817
919
1019
1123
1219
1321
1429
1531
1631
1731
1837
1937
2041
2143
2243
2347
2443
2543
2653
2743
2841
2959
3061
3161
3261
3367
3467
3571
3673
3773
3871
3979
4079
4183
4279
4379
4489
4579
4679
4779
4897
4997
50101
51103
52103
53107
54109
55109
56113
57109
58109
59113
60109

[3,5,7,7,11,13,13,17,19,19,23,19,21,29,31,31,31,
 37,37,41,43,43,47,43,43,53,43,41,59,61,61,61,67,
 67,71,73,73,71,79,79,83,79,79,89,79,79,79,97,97,
 101,103,103,107,109,109,113,109,109,113,109]