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A028790 as a simple table

na(n)
12
23
35
46
57
68
710
812
913
1017
1118
1219
1320
1421
1524
1626
1727
1828
1929
2030
2131
2232
2333
2434
2535
2638
2739
2840
2941
3043
3145
3246
3347
3448
3550
3651
3752
3854
3955
4057
4159
4261
4362
4463
4565
4666
4768
4869
4972
5073
5174
5275
5376

[2,3,5,6,7,8,10,12,13,17,18,19,20,21,24,26,27,28,
 29,30,31,32,33,34,35,38,39,40,41,43,45,46,47,48,
 50,51,52,54,55,57,59,61,62,63,65,66,68,69,72,73,
 74,75,76]