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A038573 as a simple table

na(n)
00
11
21
33
41
53
63
77
81
93
103
117
123
137
147
1515
161
173
183
197
203
217
227
2315
243
257
267
2715
287
2915
3015
3131
321
333
343
357
363
377
387
3915
403
417
427
4315
447
4515
4615
4731
483
497
507
5115
527
5315
5415
5531
567
5715
5815
5931
6015
6131
6231
6363
641
653
663
677
683
697
707
7115
723
737
747
7515
767
7715
7815
7931
803
817
827
8315
847
8515
8615
8731

[0,1,1,3,1,3,3,7,1,3,3,7,3,7,7,15,1,3,3,7,3,7,7,
 15,3,7,7,15,7,15,15,31,1,3,3,7,3,7,7,15,3,7,7,15,
 7,15,15,31,3,7,7,15,7,15,15,31,7,15,15,31,15,31,
 31,63,1,3,3,7,3,7,7,15,3,7,7,15,7,15,15,31,3,7,7,
 15,7,15,15,31]