Numbers k such that R_k + 50 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A256723
Numbers k such that R_k + 50 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =2a(1) =5a(2) =8a(3) =18a(4) =38a(5) =1919a(6) =1934a(7) =4250a(8) =4397a(9) =12626a(10) =13151a(11) =26693a(12) =81353a(13) =83916
External references
- oeis: A256723