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A084924 as a simple table

na(n)
13
27
331
4127
51279
63583
75119
86143
98191
1081919
11131071
12524287
1314680063
14109051903
15654311423
16738197503
172147483647
1821474836479
1951539607551
20824633720831
2113743895347199
2226388279066623
23246290604621823

[3,7,31,127,1279,3583,5119,6143,8191,81919,131071,
 524287,14680063,109051903,654311423,738197503,
 2147483647,21474836479,51539607551,824633720831,
 13743895347199,26388279066623,246290604621823]