Numbers n such that 8*10^n + R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
A103071
Numbers n such that 8*10^n + R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
Terms
- a(0) =1a(1) =10a(2) =24a(3) =199a(4) =745a(5) =7753a(6) =17938a(7) =21319a(8) =24948a(9) =26119a(10) =29454a(11) =51889a(12) =62824a(13) =88105
External references
- oeis: A103071