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A028780 as a simple table

na(n)
12
23
35
47
58
611
712
813
918
1020
1127
1228
1330
1431
1532
1634
1738
1841
1942
2043
2144
2245
2346
2448
2550
2651
2752
2853
2957
3058
3161
3263
3366

[2,3,5,7,8,11,12,13,18,20,27,28,30,31,32,34,38,41,
 42,43,44,45,46,48,50,51,52,53,57,58,61,63,66]