Numbers k such that R_k + 80 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A256762
Numbers k such that R_k + 80 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =3a(1) =6a(2) =27a(3) =30a(4) =108a(5) =119a(6) =209a(7) =444a(8) =1050a(9) =15189a(10) =16401a(11) =81363a(12) =134385a(13) =135011
External references
- oeis: A256762