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A115873 as a simple table

na(n)
11
21
33
41
57
63
77
81
915
107
113
123
135
147
1515
161
1731
1815
197
207
2131
223
237
243
2531
265
2731
287
2931
3015
3131
321
3363
3431
3515
3615
377
387
397
407
4163
4231
433
443
4563
467
4715
483
4921
5031
5163
525
5363
5431
557
567
579
5831
5963
6015
6121
6231
6363
641
65127
6663
6731
6831
6915
7015
7115
7215
73127
747
7531
767
7715
787
7915
807
8151

[1,1,3,1,7,3,7,1,15,7,3,3,5,7,15,1,31,15,7,7,31,3,
 7,3,31,5,31,7,31,15,31,1,63,31,15,15,7,7,7,7,63,
 31,3,3,63,7,15,3,21,31,63,5,63,31,7,7,9,31,63,15,
 21,31,63,1,127,63,31,31,15,15,15,15,127,7,31,7,15,
 7,15,7,51]