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A076275 as a simple table

na(n)
11
25
317
421
565
685
7257
8273
9341
101025
111365
124097
134161
144369
155461
1616385
1721845
1865537
1965793
2069905
2187381
22262145
23266305
24349525
251048577
261049601
271118481
281398101
294194305
305592405
3116777217
3216781313
3316843009
3417043521
3517895697
3622369621

[1,5,17,21,65,85,257,273,341,1025,1365,4097,4161,
 4369,5461,16385,21845,65537,65793,69905,87381,
 262145,266305,349525,1048577,1049601,1118481,
 1398101,4194305,5592405,16777217,16781313,
 16843009,17043521,17895697,22369621]