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A100382 as a simple table

na(n)
13
27
313
431
5127
6307
71093
81723
92801
103541
118191
1210303
1319531
1428057
1530941
16131071
17147073
18524287
19797161
20830833
211191373
221204507
231353733
241395943
251424443
261482307
271886503
282037757
292212657
302432041
312507473
322922391

[3,7,13,31,127,307,1093,1723,2801,3541,8191,10303,
 19531,28057,30941,131071,147073,524287,797161,
 830833,1191373,1204507,1353733,1395943,1424443,
 1482307,1886503,2037757,2212657,2432041,2507473,
 2922391]