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A089162 as a simple table

na(n)
13
27
331
4127
523
689
78191
8131071
9524287
1047
11178481
12233
131103
142089
152147483647
16223
17616318177
1813367
19164511353
20431
219719
222099863
232351
244513
2513264529
266361
2769431
2820394401
29179951
303203431780337
312305843009213693951
32193707721
33761838257287

[3,7,31,127,23,89,8191,131071,524287,47,178481,
 233,1103,2089,2147483647,223,616318177,13367,
 164511353,431,9719,2099863,2351,4513,13264529,
 6361,69431,20394401,179951,3203431780337,
 2305843009213693951,193707721,761838257287]