Numbers k such that R_k + 9*10^k + 8 is prime, where R_k = 11...11 is the repunit (A002275) of length k.
A259141
Numbers k such that R_k + 9*10^k + 8 is prime, where R_k = 11...11 is the repunit (A002275) of length k.
Terms
- a(0) =0a(1) =2a(2) =246a(3) =1140a(4) =10394a(5) =43880
External references
- oeis: A259141