Numbers k such that 9*R_k - 8 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
A095714
Numbers k such that 9*R_k - 8 is prime, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =3a(1) =5a(2) =7a(3) =33a(4) =45a(5) =105a(6) =197a(7) =199a(8) =281a(9) =301a(10) =317a(11) =1107a(12) =1657a(13) =3395a(14) =35925a(15) =37597a(16) =64305a(17) =80139a(18) =221631
External references
- oeis: A095714