Numbers k such that 2*10^k + R_k + 6 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A102949
Numbers k such that 2*10^k + R_k + 6 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =36a(1) =183a(2) =330a(3) =393a(4) =17520a(5) =27222a(6) =285615a(7) =328590a(8) =330041a(9) =345503
External references
- oeis: A102949