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A358415 as a simple table

na(n)
12
23
37
43
531
641
7127
841
943
107
11113
127
138191
146
156
16313
17131071
18211457
19524287
2053
214217
22433
2341
24547
252243
26691921
2721275809
28673
2976831
30467
312147483647
3289
33112337
34401
3517681
369342799
3712011
389511
3919
401061129
41164524721
425460123943
4371
44106661
4533188053169
46211
4741

[2,3,7,3,31,41,127,41,43,7,113,7,8191,6,6,313,
 131071,211457,524287,53,4217,433,41,547,2243,
 691921,21275809,673,76831,467,2147483647,89,
 112337,401,17681,9342799,12011,9511,19,1061129,
 164524721,5460123943,71,106661,33188053169,211,41]