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A050521 as a simple table

na(n)
11
21
31
43
51
67
71
810
94
107
111
1233
131
147
159
1628
171
1839
191
2033
219
227
231
24133
254
267
2715
2833
291
3091
311
3280
339
347
359
36229
371
387
399
40133
411
4291
431
4433
4553
467
471
48474
494
5039
519
5233
531
54175
559
56133
579
587
591
60569
611
627
6353
64208
659
6691
671
6833
699
7091
711

[1,1,1,3,1,7,1,10,4,7,1,33,1,7,9,28,1,39,1,33,9,7,
 1,133,4,7,15,33,1,91,1,80,9,7,9,229,1,7,9,133,1,
 91,1,33,53,7,1,474,4,39,9,33,1,175,9,133,9,7,1,
 569,1,7,53,208,9,91,1,33,9,91,1]