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A277321 as a simple table

na(n)
12
22
33
43
55
65
717
85
97
105
117
1211
13257
147
1511
1619
1713
187
1919
207
2117
2267
23131
2465537
2513
267
2737
2867
2911
30131
3113
3241
3311
3413
3537
3673
374099
3813
39137
4011
4119
4237
4332771
444099
4523
4617
4765539
4811
492053
5019
51262147
52521
5337
5432771
551033
5623
5797
5813
5965539
6011
6111
6271
63262147
6443
6523
6613
6717
6811
69193
7011
7141
72268435459
732053
7471

[2,2,3,3,5,5,17,5,7,5,7,11,257,7,11,19,13,7,19,7,
 17,67,131,65537,13,7,37,67,11,131,13,41,11,13,37,
 73,4099,13,137,11,19,37,32771,4099,23,17,65539,11,
 2053,19,262147,521,37,32771,1033,23,97,13,65539,
 11,11,71,262147,43,23,13,17,11,193,11,41,
 268435459,2053,71]