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A100289
as a simple table
n
a(n)
1
2
2
3
3
4
4
5
5
7
6
8
7
10
8
18
9
21
10
42
11
51
12
91
13
133
14
177
15
182
16
310
17
3175
18
9566
19
32841
[2,3,4,5,7,8,10,18,21,42,51,91,133,177,182,310, 3175,9566,32841]