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A138866 as a simple table

na(n)
133
277
33131
4127127
5819191
6131071
7524287
8214647
9230951
10618111
11162127
12170727
13686151
14531127
15104087
16147007
17446351
18259071
19190991
20285607
21478111
22346551
23281191
24431471
25448751
26402511
27854671
28536207
29521007
30512311
31746447
32174887
33129591
34412527
35814711
36623151
37127271
38437791
39924071
40125047
41299407
42122247
43315871
44124871
45202927
46169751
47316511

[33,77,3131,127127,819191,131071,524287,214647,
 230951,618111,162127,170727,686151,531127,104087,
 147007,446351,259071,190991,285607,478111,346551,
 281191,431471,448751,402511,854671,536207,521007,
 512311,746447,174887,129591,412527,814711,623151,
 127271,437791,924071,125047,299407,122247,315871,
 124871,202927,169751,316511]