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A288448
as a simple table
n
a(n)
1
5
2
9
3
17
4
21
5
29
6
53
7
57
8
105
9
111
10
279
11
303
12
435
13
483
14
677
15
1049
16
1217
17
1395
18
9651
19
26031
20
31937
[5,9,17,21,29,53,57,105,111,279,303,435,483,677, 1049,1217,1395,9651,26031,31937]