Numbers k such that 9 + 10^k + 9*100^k is prime.
A171227
Numbers k such that 9 + 10^k + 9*100^k is prime.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =17a(4) =26a(5) =28a(6) =47a(7) =70a(8) =91a(9) =1129a(10) =4334a(11) =12347a(12) =20212
External references
- oeis: A171227