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A318261 as a simple table

na(n)
13
23
37
45
53
67
715
85
93
107
1115
1231
139
145
1521
163
177
1815
1931
2063
219
2221
233
247
2515
2631
2763
28127
2917
309
315
3221
3385
343
3551
367
3715
3831
3963
40127
41255
4217
439
4473
455
4621
4785
483
4951
507
5115
5231
5363
54127
55255
56511
5733
5817
5973
605
6121
6285
63341
6411
6593
663
6751
687
6915
7031

[3,3,7,5,3,7,15,5,3,7,15,31,9,5,21,3,7,15,31,63,9,
 21,3,7,15,31,63,127,17,9,5,21,85,3,51,7,15,31,63,
 127,255,17,9,73,5,21,85,3,51,7,15,31,63,127,255,
 511,33,17,73,5,21,85,341,11,93,3,51,7,15,31]