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A093868 as a simple table

na(n)
12
23
32
43
511
65
713
87
917
1011
1123
1211
1353
1413
1529
1617
1767
1817
1937
2019
2141
2223
2347
2423
25101
2653
2753
2829
2959
3029
3161
3231
3367
3467
3571
3637
3773
3837
3979
4041
4183
4241
43173
4443
4589
4647
47281
4847
4997
50101
51101
5253
53107
5453
55109
56113
57113
5859
59353
6059
61367
6261
63127
64127
65131
6667
67269

[2,3,2,3,11,5,13,7,17,11,23,11,53,13,29,17,67,17,
 37,19,41,23,47,23,101,53,53,29,59,29,61,31,67,67,
 71,37,73,37,79,41,83,41,173,43,89,47,281,47,97,
 101,101,53,107,53,109,113,113,59,353,59,367,61,
 127,127,131,67,269]