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A093164 Primes of the form 50*R_k + 3, where R_k is the repunit (A002275) of length k. 2
3, 53, 55555553, 55555555555555555555555553, 555555555555555555555555555555555555555555555555555555555555555553, 55555555555555555555555555555555555555555555555555555555555555555555555553 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes of the form (5*10^k - 23)/9. - Vincenzo Librandi, Nov 16 2010

LINKS

Table of n, a(n) for n=1..6.

Makoto Kamada, Prime numbers of the form 55...553.

Index entries for primes involving repunits

CROSSREFS

Cf. A056685 (corresponding k).

Sequence in context: A173357 A144537 A208631 * A092448 A344424 A045481

Adjacent sequences:  A093161 A093162 A093163 * A093165 A093166 A093167

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Mar 26 2004

STATUS

approved

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Last modified July 26 13:40 EDT 2021. Contains 346294 sequences. (Running on oeis4.)