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A392963 as a simple table

na(n)
21
31
41
53
61
73
81
93
1010
111
123
137
141
153
167
1735
181
193
207
2126
221
233
246
2515
26126
271
283
295
3015
3166
321
333
344
3512

[1,1,1,3,1,3,1,3,10,1,3,7,1,3,7,35,1,3,7,26,1,3,6,
 15,126,1,3,5,15,66,1,3,4,12]