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A093169 Primes of the form 50*R_n + 7, where R_n is the repunit (A002275) of length n. 0
7, 557, 5557, 555557, 5555555557, 555555555555557, 5555555555555555555557, 5555555555555555555555555555555555555555555555555555555555555555555555555555555555555557 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Primes of the form (5*10^n+13)/9 [From Vincenzo Librandi, Nov 16 2010]

CROSSREFS

Cf. A056686 (corresponding n).

Sequence in context: A124899 A056852 A126196 * A159029 A068616 A080810

Adjacent sequences:  A093166 A093167 A093168 * A093170 A093171 A093172

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.