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A186890 as a simple table

na(n)
11
23
37
49
511
615
727
831
949
1059
1163
12123
13127
14135
15177
16201
17225
18251
19255
20287
21297
22363
23377
24433
25441
26507
27511
28567
29729
30855
31945
32961
331019
341023
351401
361969
372043
382047
393087
403135
413143
423449
433969
444017
454091
464095
475929
487545
498113
508187
518191

[1,3,7,9,11,15,27,31,49,59,63,123,127,135,177,201,
 225,251,255,287,297,363,377,433,441,507,511,567,
 729,855,945,961,1019,1023,1401,1969,2043,2047,
 3087,3135,3143,3449,3969,4017,4091,4095,5929,7545,
 8113,8187,8191]