A006031
formatted as a simple table:
n
a(n)
1
3
2
7
3
137
4
283
5
883
6
991
7
1021
8
1193
9
3671
[3,7,137,283,883,991,1021,1193,3671]
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N. J. A. Sloane
(
njas@research.att.com
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
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