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A278923 as a simple table

na(n)
10
20
30
40
50
60
70
83
90
103
113
125
135
143
155
167
175
187
197
207
2111
2211
235
2411
2513
2611
2713
2813
2911
3017
3113
3213
3317
3417
3517
3619
3719
3813
3917
4019
4117
4223
4319
4419
4523
4623
4723
4823
4929
5023
5129
5229
5323
5429
5531
5631
5729
5831
5929
6031
6137
6229
6337
6437
6531
6641
6737
6831
6941
7037
7141
7243
7341
7441
7543
7643
7741
7843
7943
8047
8147
8243
8341
8447
8543
8647
8753
8847
8947
9053
9153
9253
9353
9459
9547

[0,0,0,0,0,0,0,3,0,3,3,5,5,3,5,7,5,7,7,7,11,11,5,
 11,13,11,13,13,11,17,13,13,17,17,17,19,19,13,17,
 19,17,23,19,19,23,23,23,23,29,23,29,29,23,29,31,
 31,29,31,29,31,37,29,37,37,31,41,37,31,41,37,41,
 43,41,41,43,43,41,43,43,47,47,43,41,47,43,47,53,
 47,47,53,53,53,53,59,47]