Numbers k such that 9*10^(2*k) + 9*10^k + 1 is prime.
A309743
Numbers k such that 9*10^(2*k) + 9*10^k + 1 is prime.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =6a(4) =12a(5) =245a(6) =298a(7) =2967a(8) =4321a(9) =7225a(10) =11267
External references
- oeis: A309743