Numbers n such that 8*10^n + R_n + 8 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
A103073
Numbers n such that 8*10^n + R_n + 8 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
Terms
- a(0) =1a(1) =4a(2) =7a(3) =9a(4) =19a(5) =22a(6) =70a(7) =102a(8) =121a(9) =123a(10) =235a(11) =360a(12) =594a(13) =1614a(14) =2410a(15) =16048a(16) =16174
External references
- oeis: A103073