The On-Line Encyclopedia of Integer Sequences (OEIS)

A093166 revision #19

A093166

Primes of the form 80*R_k + 3, where R_k is the repunit (A002275) of length k.

3, 83, 883, 88883, 88888883, 888888883, 888888888888883, 888888888888888888888888888888888888888888888888883, 88888888888888888888888888888888888888888888888888888888888888888888883

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OFFSET

1,1

COMMENTS

Primes of the form (8*10^k - 53)/9. - Vincenzo Librandi, Nov 16 2010

LINKS

Table of n, a(n) for n=1..9.

Makoto Kamada, Prime numbers of the form 88...883.

Index entries for primes involving repunits

MATHEMATICA

Select[Table[FromDigits[PadLeft[{3}, n, 8]], {n, 80}], PrimeQ] (* Harvey P. Dale, Sep 21 2013 *)

CROSSREFS

Cf. A002275, A056694 (corresponding k), A099422.

Sequence in context: A036943 A178001 A173811 * A111648 A013518 A166241

Adjacent sequences: A093163 A093164 A093165 * A093167 A093168 A093169

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Mar 26 2004

STATUS

proposed