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A105222 as a simple table

na(n)
12
23
32
45
52
67
72
89
98
1011
112
1213
132
1415
154
1617
172
1819
192
2021
218
2223
232
2425
257
2627
2726
289
292
3031
312
3233
3310
3435
356
3637
372
3839
3914
4041
412
4243
432
4445
458
4647
472
4849
4918
5051
5116
529
532
5455
5521
5657
5720
5859
592
6061
612
6263
638
6465
658
6625
672
6869
6922
7011
712
7273
732
7475
7526

[2,3,2,5,2,7,2,9,8,11,2,13,2,15,4,17,2,19,2,21,8,
 23,2,25,7,27,26,9,2,31,2,33,10,35,6,37,2,39,14,41,
 2,43,2,45,8,47,2,49,18,51,16,9,2,55,21,57,20,59,2,
 61,2,63,8,65,8,25,2,69,22,11,2,73,2,75,26]