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A286972 as a simple table

na(n)
12
23
34
45
57
69
711
812
913
1015
1117
1219
1321
1423
1525
1627
1729
1831
1933
2035
2137
2239
2341
2442
2543
2647
2749
2851
2953
3055
3157
3259
3361
3464
3565
3667
3769
3871
3973
4075
4177
4278
4379
4480
4581
4683
4784
4885
4987
5089
5191
5293
5395
5497
55100
56101
57103
58105
59107
60108
61109
62110
63111
64113
65114
66115
67119
68121
69123
70127
71129
72131
73132
74133
75135
76137
77139

[2,3,4,5,7,9,11,12,13,15,17,19,21,23,25,27,29,31,
 33,35,37,39,41,42,43,47,49,51,53,55,57,59,61,64,
 65,67,69,71,73,75,77,78,79,80,81,83,84,85,87,89,
 91,93,95,97,100,101,103,105,107,108,109,110,111,
 113,114,115,119,121,123,127,129,131,132,133,135,
 137,139]