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A083501 as a simple table

na(n)
12
23
34
45
56
67
74
89
97
1011
1112
1213
139
149
1516
1617
1718
187
1911
2021
2116
2223
2324
2425
2526
269
2710
2825
2930
3031
3125
3233
3334
3435
3511
3613
3726
3839
3916
4041
4142
4225
4336
4445
4516
4647
4748
4849
4918
5051
5152
5229
5354
5419
5556
5625
5749
5859
5960
6061
6147
6225
6316
6465
6561
6667
6729
6869
6970
7051
7172
7225
7364
7447

[2,3,4,5,6,7,4,9,7,11,12,13,9,9,16,17,18,7,11,21,
 16,23,24,25,26,9,10,25,30,31,25,33,34,35,11,13,26,
 39,16,41,42,25,36,45,16,47,48,49,18,51,52,29,54,
 19,56,25,49,59,60,61,47,25,16,65,61,67,29,69,70,
 51,72,25,64,47]