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A127582 as a simple table

na(n)
02
13
23
37
431
531
6127
7127
81279
93583
105119
116143
128191
138191
1481919
15131071
16131071
17131071
18524287
19524287
2014680063
2114680063
22109051903
23109051903
24654311423
25738197503
26738197503
272147483647
282147483647
292147483647

[2,3,3,7,31,31,127,127,1279,3583,5119,6143,8191,
 8191,81919,131071,131071,131071,524287,524287,
 14680063,14680063,109051903,109051903,654311423,
 738197503,738197503,2147483647,2147483647,
 2147483647]