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A126762 as a simple table

na(n)
12
23
35
45
57
67
711
89
911
1011
1113
1213
1317
1415
1517
1617
1719
1819
1923
2021
2123
2223
2329
2425
2528
2627
2729
2829
2931
3031
3137
3233
3337
3435
3537
3637
3741
3839
3941
4041
4143
4243
4347
4445
4547
4647
4753
4849
4953
5051
5153
5253
5359
5455
5559
5657
5759
5859
5961
6061
6167
6263
6367
6465
6567
6667
6771
6869
6971
7071
7173
7273

[2,3,5,5,7,7,11,9,11,11,13,13,17,15,17,17,19,19,
 23,21,23,23,29,25,28,27,29,29,31,31,37,33,37,35,
 37,37,41,39,41,41,43,43,47,45,47,47,53,49,53,51,
 53,53,59,55,59,57,59,59,61,61,67,63,67,65,67,67,
 71,69,71,71,73,73]