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A254863 as a simple table

na(n)
13
25
37
45
53
67
723
85
911
1017
11101
127
1329
1423
1517
1659
1737
1811
1979
2031
2123
22101
2371
2413
2553
2629
2783
2843
29349
3017
3197
3267
33101
3437
35107
3619
37113
3879
3941
4061
41211
4223
4389
44157
4547
4671
47283
4873
49443
5053
51103
5229
53641
5483
55167
5659
57229
58349
59239
6031
61613
6297
63317
6467
65197
66101
67137
6837
6971
70107
71431
7273

[3,5,7,5,3,7,23,5,11,17,101,7,29,23,17,59,37,11,
 79,31,23,101,71,13,53,29,83,43,349,17,97,67,101,
 37,107,19,113,79,41,61,211,23,89,157,47,71,283,73,
 443,53,103,29,641,83,167,59,229,349,239,31,613,97,
 317,67,197,101,137,37,71,107,431,73]