Numbers k such that 10^(2*k) - 8*10^(k-1) - 1 is prime.
A331815
Numbers k such that 10^(2*k) - 8*10^(k-1) - 1 is prime.
Terms
- a(0) =3a(1) =4a(2) =132a(3) =471a(4) =1935a(5) =4258a(6) =9444
External references
- oeis: A331815
A331815
Numbers k such that 10^(2*k) - 8*10^(k-1) - 1 is prime.