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A163381 as a simple table

na(n)
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
3813
3915
405
4113
4221
4323
4411
4527
4623
4731
483
497
5011
5115
5213
5323
5427
5531
567
5715
5823
5931
6015
6131
6231
6363
641
653
665
677
689
6911
7013
7115
729
7319
7421
7523
7619
7727
7829
7931
805
8113
8221
8329

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