Numbers k such that k * (10^k - 1) + 1 is prime.
A109137
Numbers k such that k * (10^k - 1) + 1 is prime.
Terms
- a(0) =2a(1) =14a(2) =42a(3) =144a(4) =200a(5) =302a(6) =7242a(7) =8718a(8) =10568a(9) =24438a(10) =41734
External references
- oeis: A109137