Numbers k such that R_k - 10 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A256711
Numbers k such that R_k - 10 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =3a(1) =8a(2) =12a(3) =17a(4) =86a(5) =146a(6) =1428a(7) =1949a(8) =4809a(9) =16922a(10) =33102a(11) =125792a(12) =211610
External references
- oeis: A256711