Numbers k for which 8*R_k + 1 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A096508
Numbers k for which 8*R_k + 1 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =2a(1) =14a(2) =17a(3) =35a(4) =4175a(5) =4472a(6) =9812a(7) =12260a(8) =12341a(9) =13760a(10) =14576a(11) =53411a(12) =144683a(13) =148328
External references
- oeis: A096508