Numbers k such that 9*10^k + R_k + 6 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A100473
Numbers k such that 9*10^k + R_k + 6 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =1a(1) =17a(2) =23a(3) =73a(4) =131a(5) =473a(6) =685a(7) =701a(8) =1909a(9) =3029a(10) =3473a(11) =4193a(12) =9931
External references
- oeis: A100473