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A331217 as a simple table

na(n)
02
15
23
37
447
531
6191
7127
816127
93583
1015359
116143
121044479
138191
14245759
1516744447
164128767
17131071
18786431
19524287
20274876858367
2114680063
224398042316799
23260046847
244278190079
254261412863
261125899839733759
27576460752169205759
2816911433727

[2,5,3,7,47,31,191,127,16127,3583,15359,6143,
 1044479,8191,245759,16744447,4128767,131071,
 786431,524287,274876858367,14680063,4398042316799,
 260046847,4278190079,4261412863,1125899839733759,
 576460752169205759,16911433727]