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A270813
as a simple table
n
a(n)
2
2
3
3
4
5
5
6
6
8
7
9
8
10
9
11
10
17
11
13
12
21
13
21
14
24
15
26
16
22
17
17
18
30
19
37
20
50
21
23
22
16
23
53
24
55
25
12
26
61
[2,3,5,6,8,9,10,11,17,13,21,21,24,26,22,17,30,37, 50,23,16,53,55,12,61]