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A218288 as a simple table

na(n)
11
23
33
47
515
67
715
863
963
1015
1131
12255
13511
14255
1531
1661
171019
184091
194091
201019
2161
22121
234073
2432739
2565507
2632739
274073
28121
29241
3016289
31261905
321048307
331048307
34261905
3516289
36241
37481
3865153
392095233
4016772877
4133549827
4216772877
432095233

[1,3,3,7,15,7,15,63,63,15,31,255,511,255,31,61,
 1019,4091,4091,1019,61,121,4073,32739,65507,32739,
 4073,121,241,16289,261905,1048307,1048307,261905,
 16289,241,481,65153,2095233,16772877,33549827,
 16772877,2095233]