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A173818 3*n-1 is a circular prime. 1
1, 2, 4, 6, 38, 66, 398, 1260, 3980 (list; graph; refs; listen; history; text; internal format)
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 October 22 16:15 EDT 2021. Contains 348174 sequences. (Running on oeis4.)