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A292448 as a simple table

na(n)
13
27
313
431
5127
6307
71723
82801
93541
108191
1119531
1286143
13131071
14492103
15524287
16552793
17684757
18704761
19735307
20797161
211353733
221886503
233413257
243894703
255473261
267094233
277781311
289250723
2910378063
3012655807
3118143341
3219443691
3322292563
3423907211

[3,7,13,31,127,307,1723,2801,3541,8191,19531,
 86143,131071,492103,524287,552793,684757,704761,
 735307,797161,1353733,1886503,3413257,3894703,
 5473261,7094233,7781311,9250723,10378063,12655807,
 18143341,19443691,22292563,23907211]