Initial prime, greater than 7, of a prime chain of length n under the iteration x -> 2x-7.
A128509
Initial prime, greater than 7, of a prime chain of length n under the iteration x -> 2x-7.
Terms
- a(0) =11a(1) =13a(2) =13a(3) =367a(4) =4987a(5) =9697a(6) =78007a(7) =13356127a(8) =13356127a(9) =6753069187a(10) =218617084627
External references
- oeis: A128509