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A120724 as a simple table

na(n)
12
23
35
45
57
611
77
89
913
1011
1113
1217
1323
1413
1515
1619
1725
1817
1919
2023
2129
2237
2319
2421
2525
2631
2739
2823
2925
3029
3135
3243
3329
3431
3535
3641
3749
3831
3933
4037
4143
4251
4361
4437
4539
4643
4749
4857
4967
5041
5143
5247
5353
5461
5571
5683
5743
5845
5949
6055
6163
6273
6385
6447
6549
6653
6759
6867
6977
7089

[2,3,5,5,7,11,7,9,13,11,13,17,23,13,15,19,25,17,
 19,23,29,37,19,21,25,31,39,23,25,29,35,43,29,31,
 35,41,49,31,33,37,43,51,61,37,39,43,49,57,67,41,
 43,47,53,61,71,83,43,45,49,55,63,73,85,47,49,53,
 59,67,77,89]