Numbers k such that 10^k * (10^k - 1) - 1 is prime.
A265383
Numbers k such that 10^k * (10^k - 1) - 1 is prime.
Terms
- a(0) =1a(1) =6a(2) =9a(3) =154a(4) =253a(5) =1114a(6) =1390a(7) =2618a(8) =5611a(9) =12871a(10) =15286a(11) =108609a(12) =132574a(13) =164369a(14) =188484
External references
- oeis: A265383