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A256405 as a simple table

na(n)
12
23
33
45
55
65
75
89
99
109
119
1213
1313
1413
1513
1617
1717
1817
1917
2017
2122
2222
2322
2425
2525
2625
2725
2825
2929
3029
3129
3229
3329
3429
3529
3629
3729
3829
3929
4040
4141
4242
4343
4444
4545
4646
4747
4848
4949
5050
5151
5252
5353
5454
5555
5656
5757
5858
5959
6060
6161
6262
6363
6464
6565
6666
6767

[2,3,3,5,5,5,5,9,9,9,9,13,13,13,13,17,17,17,17,17,
 22,22,22,25,25,25,25,25,29,29,29,29,29,29,29,29,
 29,29,29,40,41,42,43,44,45,46,47,48,49,50,51,52,
 53,54,55,56,57,58,59,60,61,62,63,64,65,66,67]