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A252791
as a simple table
n
a(n)
1
2
2
3
3
5
4
7
5
11
6
23
7
41
8
55
9
73
10
91
11
131
12
199
13
221
14
287
[2,3,5,7,11,23,41,55,73,91,131,199,221,287]
