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A247681 as a simple table

na(n)
11
255
391
4145
5217
6235
7253
8289
9325
10343
11361
12415
13451
14469
15505
16559
17595
18649
19667
20685
21703
22721
23775
24793
25847
26865
27901
28955
29973
301027
311045
321081
331099
341135
351189
361207
371225
381243
391261
401315
411333
421351
431369
441387
451405

[1,55,91,145,217,235,253,289,325,343,361,415,451,
 469,505,559,595,649,667,685,703,721,775,793,847,
 865,901,955,973,1027,1045,1081,1099,1135,1189,
 1207,1225,1243,1261,1315,1333,1351,1369,1387,1405]