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A318516 as a simple table

na(n)
11
21
33
42
55
63
77
84
97
105
1111
126
1313
147
1515
168
1717
189
1919
2010
2115
2211
2323
2412
2521
2613
2727
2814
2929
3015
3131
3216
3331
3417
3531
3618
3737
3819
3931
4020
4141
4221
4343
4422
4531
4623
4747
4824
4947
5025
5151
5226
5353
5427
5547
5628
5755
5829
5959
6030
6161
6231
6363
6432
6561
6633
6767
6834
6963
7035
7171
7236
7373
7437
7559
7638
7775
7839
7979
8040
8163
8241
8383
8442

[1,1,3,2,5,3,7,4,7,5,11,6,13,7,15,8,17,9,19,10,15,
 11,23,12,21,13,27,14,29,15,31,16,31,17,31,18,37,
 19,31,20,41,21,43,22,31,23,47,24,47,25,51,26,53,
 27,47,28,55,29,59,30,61,31,63,32,61,33,67,34,63,
 35,71,36,73,37,59,38,75,39,79,40,63,41,83,42]