Numbers n such that 3*10^n + 2*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
A102967
Numbers n such that 3*10^n + 2*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
Terms
- a(0) =1a(1) =42a(2) =5022
External references
- oeis: A102967