Numbers k such that R_(k+2) + 8*10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A256934
Numbers k such that R_(k+2) + 8*10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =0a(1) =1a(2) =12a(3) =16a(4) =33a(5) =37a(6) =42a(7) =6643a(8) =35157a(9) =63202a(10) =125292a(11) =200746
External references
- oeis: A256934