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A186645 as a simple table

na(n)
13
27
311
413
519
629
731
837
971
10127
11379
12491
132047
142633
152659
163373
178191
1813249
1926893
2070687
2174597
2287211
23131071
24184511
25524287
26642581
271897121
282676301
292703739
308388607
3115456151
3252368101
33102785339
34126233057
35193481677
36536870911
37856645921
381552107133
392001907169
402147483647
412935442621
423668158729
436004262437

[3,7,11,13,19,29,31,37,71,127,379,491,2047,2633,
 2659,3373,8191,13249,26893,70687,74597,87211,
 131071,184511,524287,642581,1897121,2676301,
 2703739,8388607,15456151,52368101,102785339,
 126233057,193481677,536870911,856645921,
 1552107133,2001907169,2147483647,2935442621,
 3668158729,6004262437]