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A173062 as a simple table

na(n)
13
27
331
4103
5127
6337
71663
85407
98191
10131071
11346111
12524287
132970343
143655807
1522151167
16109051903
17617831551
181631461441
192007952543
202147483647
2132127240703
22194664464383
23275716983697
24958348132351
251357375919743
261670616516607
2749834102882303
2857349132609183

[3,7,31,103,127,337,1663,5407,8191,131071,346111,
 524287,2970343,3655807,22151167,109051903,
 617831551,1631461441,2007952543,2147483647,
 32127240703,194664464383,275716983697,
 958348132351,1357375919743,1670616516607,
 49834102882303,57349132609183]