Numbers n such that 8*10^n + R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
A103072
Numbers n such that 8*10^n + R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
Terms
- a(0) =3a(1) =9a(2) =17a(3) =153a(4) =194a(5) =641a(6) =675a(7) =1461a(8) =26429a(9) =48461a(10) =72735
External references
- oeis: A103072