A109612
formatted as a simple table:
n
a(n)
1
3
2
9
3
21
4
23
5
41
6
47
7
51
8
57
9
63
10
81
[3,9,21,23,41,47,51,57,63,81]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 6 19:58 EST 2009. Contains 170429 sequences.
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