Numbers k such that 2*10^k + R_k + 8 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A102950
Numbers k such that 2*10^k + R_k + 8 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =1a(1) =223a(2) =318a(3) =427a(4) =3727a(5) =5227a(6) =8779a(7) =11383a(8) =15415a(9) =26382
External references
- oeis: A102950