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A373886 as a simple table

na(n)
00
11
21
33
41
53
63
77
81
93
105
117
123
137
147
1515
161
173
186
197
205
2111
2213
2315
243
257
2611
2715
287
2915
3015
3131
321
333
346
357
369
3713
3814
3915
405
4111
4221
4323
4413
4527
4629
4731
483
497
5014
5115
5211
5323
5427
5531
567
5715
5823
5931
6015
6131
6231
6363
641
653
666
677
6812
6913
7014
7115
729
7319

[0,1,1,3,1,3,3,7,1,3,5,7,3,7,7,15,1,3,6,7,5,11,13,
 15,3,7,11,15,7,15,15,31,1,3,6,7,9,13,14,15,5,11,
 21,23,13,27,29,31,3,7,14,15,11,23,27,31,7,15,23,
 31,15,31,31,63,1,3,6,7,12,13,14,15,9,19]