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A006034
as a simple table
n
a(n)
1
3
2
5
3
7
4
11
5
47
6
71
7
419
8
4799
9
35149
10
54919
11
74509
12
1990523
[3,5,7,11,47,71,419,4799,35149,54919,74509, 1990523]