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A333986 as a simple table

na(n)
12
23
32
47
52
65
73
85
97
105
117
125
13127
147
158191
165
17127
1813
1931
20127
21127
2289
2331
2417
25127
2631
273221
28179
29151
30127
318191
3213
33262657
3411939
35199
36257
37127
38127
39337
40257
41524287
4273
431093
44547
45137
46241
471093
48547
49331
50131071
511093
52599479
538191
54137
55127
568191

[2,3,2,7,2,5,3,5,7,5,7,5,127,7,8191,5,127,13,31,
 127,127,89,31,17,127,31,3221,179,151,127,8191,13,
 262657,11939,199,257,127,127,337,257,524287,73,
 1093,547,137,241,1093,547,331,131071,1093,599479,
 8191,137,127,8191]