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A093172 Primes of the form 90*R_n + 7, where R_n is the repunit (A002275) of length n. 0
7, 97, 997, 99999999999999997, 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999997 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Primes of the form (9*10^n-27)/9 [From Vincenzo Librandi, Nov 16 2010]

CROSSREFS

Cf. A056662 (corresponding n).

Sequence in context: A158579 A003618 A173833 * A074110 A155644 A011943

Adjacent sequences:  A093169 A093170 A093171 * A093173 A093174 A093175

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.