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

Offset: 1

Author

Rick L. Shepherd, Mar 26 2004

Keywords

• nonn

Comments

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

Links

• Makoto Kamada, Prime numbers of the form 88...883.
• Index entries for primes involving repunits

Crossrefs

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

Programs

Mathematica

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