Numbers k such that 8*10^k + 6*R_k + 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.

A103088

Numbers k such that 8*10^k + 6*R_k + 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =17a(4) =19a(5) =33a(6) =39a(7) =169a(8) =453a(9) =611a(10) =883a(11) =1473a(12) =6511a(13) =9647a(14) =21593a(15) =39991a(16) =40157a(17) =71503

External references