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A067933
as a simple table
n
a(n)
1
2
2
3
3
5
4
7
5
11
6
31
7
71
8
2591
9
131071
[2,3,5,7,11,31,71,2591,131071]
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Last modified April 24 08:59 EDT 2024. Contains 371935 sequences. (Running on oeis4.)