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A361315
as a simple table
n
a(n)
4
31
5
26
6
19
7
17
8
17
9
19
10
21
11
23
12
25
13
27
14
29
15
31
16
33
17
35
18
37
19
39
20
41
[31,26,19,17,17,19,21,23,25,27,29,31,33,35,37,39, 41]