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A136005 as a simple table

na(n)
13
27
331
4127
58191
6131071
7524287
82147483647
9137438953471
102199023255551
118796093022207
129007199254740991
132305843009213693951
14147573952589676412927
159444732965739290427391
16158456325028528675187087900671
172535301200456458802993406410751

[3,7,31,127,8191,131071,524287,2147483647,
 137438953471,2199023255551,8796093022207,
 9007199254740991,2305843009213693951,
 147573952589676412927,9444732965739290427391,
 158456325028528675187087900671,
 2535301200456458802993406410751]