Numbers k such that R_k + 10 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A256721
Numbers k such that R_k + 10 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =1a(1) =6a(2) =10a(3) =34a(4) =36a(5) =370a(6) =8256a(7) =13290a(8) =14724a(9) =427912a(10) =685224
External references
- oeis: A256721