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A327990 as a simple table

na(n)
00
11
23
31
47
53
61
79
815
97
103
111
1219
1317
1431
159
1615
177
183
191
2021
2139
2235
2333
2463
2519
2617
2731
289
2915
307
313
321
3343
3441
3579
3637
3771
3867
3965
40127
4121
4239
4335
4433
4563
4619
4717
4831
499
5015
517
523
531

[0,1,3,1,7,3,1,9,15,7,3,1,19,17,31,9,15,7,3,1,21,
 39,35,33,63,19,17,31,9,15,7,3,1,43,41,79,37,71,67,
 65,127,21,39,35,33,63,19,17,31,9,15,7,3,1]