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A144296
as a simple table
n
a(n)
1
3
2
5
3
7
4
13
5
17
6
19
7
31
8
41
9
43
10
47
11
53
12
71
13
79
14
89
15
103
16
127
17
131
18
137
[3,5,7,13,17,19,31,41,43,47,53,71,79,89,103,127, 131,137]