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A257771
as a simple table
n
a(n)
1
1
2
2
3
5
4
8
5
11
6
13
7
31
8
37
9
53
10
61
11
73
12
79
13
97
14
122
15
127
[1,2,5,8,11,13,31,37,53,61,73,79,97,122,127]