A027580
formatted as a simple table:
n
a(n)
1
55
2
51015
3
554455
4
51488415
5
510151015
[55,51015,554455,51488415,510151015]
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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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