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A171968 as a simple table

na(n)
01
11
21
33
41
55
63
77
81
99
105
1113
123
137
1411
1515
161
1717
189
1925
205
2113
2221
2329
243
257
2611
2715
2819
2923
3027
3131
321
3333
3417
3549
369
3725
3841
3957
405
4113
4221
4329
4437
4545
4653
4761
483
497
5011
5115
5219
5323
5427
5531
5635
5739
5843
5947
6051
6155
6259
6363

[1,1,1,3,1,5,3,7,1,9,5,13,3,7,11,15,1,17,9,25,5,
 13,21,29,3,7,11,15,19,23,27,31,1,33,17,49,9,25,41,
 57,5,13,21,29,37,45,53,61,3,7,11,15,19,23,27,31,
 35,39,43,47,51,55,59,63]