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A005765 as a simple table

na(n)
21
31
43
51
61
71
87
97
101
111
1211
131
141
151
1615
171
1816
191
2019
211
221
231
2423
2522
261
2725
2827
291
301
311
3231
331
341
351
3635
371
381
391
4039
411
421
431
4443

[1,1,3,1,1,1,7,7,1,1,11,1,1,1,15,1,16,1,19,1,1,1,
 23,22,1,25,27,1,1,1,31,1,1,1,35,1,1,1,39,1,1,1,43]