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A188713 as a simple table

na(n)
12
23
35
47
511
617
719
823
931
1047
1167
1271
1379
14127
15131
16191
17257
18263
19271
20383
211031
221039
231087
241151
251279
262063
272111
284099
294111
304127
314159
325119
336143
348191
358447
3616447
3720479
3832771
3932783
4032831
4133023
4233791
4365537

[2,3,5,7,11,17,19,23,31,47,67,71,79,127,131,191,
 257,263,271,383,1031,1039,1087,1151,1279,2063,
 2111,4099,4111,4127,4159,5119,6143,8191,8447,
 16447,20479,32771,32783,32831,33023,33791,65537]