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A278115 as a simple table

na(n)
12
28
33
45
57
618
712
85
97
1011
1113
1217
1332
1427
1520
1628
1711
1813
1917
2019
2123
2229
2331
2450
2548
2645
2728
2844
2913
3017
3119
3223
3329
3431
3537
3641
3743
3847
3972
4048
4145
4263
4344
4452
4568
4619
4723
4829
4931
5037
5141
5243
5347
5453
5559
5661
5767
5871
5998
6075
6180
6263
6344
6452
6568
6676
6792
6829
6931
7037
7141
7243
7347
7453

[2,8,3,5,7,18,12,5,7,11,13,17,32,27,20,28,11,13,
 17,19,23,29,31,50,48,45,28,44,13,17,19,23,29,31,
 37,41,43,47,72,48,45,63,44,52,68,19,23,29,31,37,
 41,43,47,53,59,61,67,71,98,75,80,63,44,52,68,76,
 92,29,31,37,41,43,47,53]