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A127581 as a simple table

na(n)
02
13
27
323
431
5127
6127
7383
81279
93583
105119
116143
128191
1373727
1481919
15131071
16131071
17524287
18524287
1914680063
2014680063
2114680063
22109051903
23109051903
24654311423
25738197503
26738197503
272147483647
282147483647
292147483647

[2,3,7,23,31,127,127,383,1279,3583,5119,6143,8191,
 73727,81919,131071,131071,524287,524287,14680063,
 14680063,14680063,109051903,109051903,654311423,
 738197503,738197503,2147483647,2147483647,
 2147483647]