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The On-Line Encyclopedia of Integer Sequences
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A129740
as a simple table
n
a(n)
1
4
2
5
3
6
4
7
5
8
6
11
7
13
8
16
9
43
10
52
11
206
12
647
[4,5,6,7,8,11,13,16,43,52,206,647]