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A028825 as a simple table

n a(n)
1 1
2 2
3 2
4 3
5 3
6 4
7 4
8 4
9 5
10 6
11 6
12 7
13 7
14 8
15 10
16 11
17 12
18 12
19 14
20 14
21 15
22 15
23 21
24 21
25 23
26 23 

[1,2,2,3,3,4,4,4,5,6,6,7,7,8,10,11,12,12,14,14,15,
 15,21,21,23,23]

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)