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A323353
as a simple table
n
a(n)
1
2
2
3
3
7
4
11
5
13
6
73
7
401
8
421
9
677
10
3673
11
4903
12
13147
13
24547
[2,3,7,11,13,73,401,421,677,3673,4903,13147,24547]