A004023
formatted as a simple table:
n
a(n)
1
2
2
19
3
23
4
317
5
1031
6
49081
7
86453
8
109297
[2,19,23,317,1031,49081,86453,109297]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
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