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A331856 as a simple table

na(n)
00
11
21
33
41
53
63
77
81
93
105
117
123
137
147
1515
161
173
185
197
205
2111
2211
2315
243
257
2611
2715
287
2915
3015
3131
321
333
345
357
369
3711
3811
3915
405
4111
4221
4323
4413
4523
4623
4731
483
497
5013
5115
5211
5323
5427
5531
567
5715
5823
5931
6015
6131
6231
6363
641
653
665
677
689
6911
7011
7115
729
7319
7421

[0,1,1,3,1,3,3,7,1,3,5,7,3,7,7,15,1,3,5,7,5,11,11,
 15,3,7,11,15,7,15,15,31,1,3,5,7,9,11,11,15,5,11,
 21,23,13,23,23,31,3,7,13,15,11,23,27,31,7,15,23,
 31,15,31,31,63,1,3,5,7,9,11,11,15,9,19,21]