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A064699
as a simple table
n
a(n)
1
1
2
3
3
7
4
17
5
19
6
31
7
47
8
383
9
2897
10
3061
11
4847
12
5359
13
10223
[1,3,7,17,19,31,47,383,2897,3061,4847,5359,10223]