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A175611 as a simple table

na(n)
12
23
35
47
531
6127
78191
8131071
9524287
102147483647
112305843009213693951
12618970019642690137449562111
13162259276829213363391578010288127
14170141183460469231731687303715884105727

[2,3,5,7,31,127,8191,131071,524287,2147483647,
 2305843009213693951,618970019642690137449562111,
 162259276829213363391578010288127,
 170141183460469231731687303715884105727]