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A105206
as a simple table
n
a(n)
3
3
4
5
5
6
6
8
7
9
8
10
9
12
10
13
11
14
12
15
13
16
14
17
15
19
16
20
17
21
18
22
19
23
20
24
21
25
22
26
[3,5,6,8,9,10,12,13,14,15,16,17,19,20,21,22,23,24, 25,26]