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A218403 as a simple table

na(n)
10
21
31
43
51
63
71
87
93
107
111
127
131
147
157
1615
171
1815
191
2015
217
2211
231
2415
255
2615
2711
2815
291
3015
311
3231
3311
3419
357
3631
371
3819
3915
4031
411
4231
431
4431
4515
4623
471
4831
497
5031
5119
5231
531
5431
5515
5631
5719
5831
591
6031
611
6231
6331
6463
6513
6663
671
6855
6923
7047
711
7263
731

[0,1,1,3,1,3,1,7,3,7,1,7,1,7,7,15,1,15,1,15,7,11,
 1,15,5,15,11,15,1,15,1,31,11,19,7,31,1,19,15,31,1,
 31,1,31,15,23,1,31,7,31,19,31,1,31,15,31,19,31,1,
 31,1,31,31,63,13,63,1,55,23,47,1,63,1]