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A093168 Primes of the form 30*R_n + 7, where R_n is the repunit (A002275) of length n. 1
7, 37, 337, 333337, 3333333333333333333333333333333333333333333337 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Primes of the form (3*10^n+33)/9; [From Vincenzo Librandi, Nov 16 2010]

CROSSREFS

Cf. A056680 (corresponding n), A173766.

Sequence in context: A089677 A075996 A173766 * A097493 A082687 A117731

Adjacent sequences:  A093165 A093166 A093167 * A093169 A093170 A093171

KEYWORD

nonn

AUTHOR

Rick L. Shepherd (rshepherd2(AT)hotmail.com), Mar 26 2004

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.