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A247822 as a simple table

na(n)
17
28191
38191
4131071
5524287
6524287
72147483647
82147483647
92305843009213693951
102305843009213693951
112305843009213693951
122305843009213693951

[7,8191,8191,131071,524287,524287,2147483647,
 2147483647,2305843009213693951,
 2305843009213693951,2305843009213693951,
 2305843009213693951]