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A173818
3*n-1 is a circular prime.
1
1, 2, 4, 6, 38, 66, 398, 1260, 3980
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..9.
CROSSREFS
Cf.
A016114
.
Sequence in context:
A195324
A175877
A269265
*
A263541
A283157
A344422
Adjacent sequences:
A173815
A173816
A173817
*
A173819
A173820
A173821
KEYWORD
nonn
,
less
AUTHOR
Juri-Stepan Gerasimov
, Feb 25 2010
STATUS
approved
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Last modified June 12 01:17 EDT 2024. Contains 373320 sequences. (Running on oeis4.)