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A162253
as a simple table
n
a(n)
1
2
2
3
3
5
4
11
5
1787
6
5381
7
5381
8
5381
9
648391
10
648391
11
414507281407
12
414507281407
[2,3,5,11,1787,5381,5381,5381,648391,648391, 414507281407,414507281407]